Orders of magnitude (numbers)

Smaller than (one googolth)

• Mathematics – Writing: Approximately is a rough first estimate of the probability that a monkey, placed in front of a typewriter, will perfectly type out William Shakespeare's play Hamlet on its first try. However, taking punctuation, capitalization, and spacing into account, the actual probability is far lower: around 10^−360,783.
• Computing: The number 1 is equal to the smallest positive non-zero value that can be represented by a quadruple-precision IEEE decimal floating-point value.
• Computing: The number 6.5 is approximately equal to the smallest positive non-zero value that can be represented by a quadruple-precision IEEE floating-point value.
• Computing: The number 3.6 is approximately equal to the smallest positive non-zero value that can be represented by an 80-bit x86 double-extended IEEE floating-point value.
• Computing: The number 1 is equal to the smallest positive non-zero value that can be represented by a double-precision IEEE decimal floating-point value.
• Computing: The number 4.9 is approximately equal to the smallest positive non-zero value that can be represented by a double-precision IEEE floating-point value.
• Computing: The number 1 is equal to the smallest positive non-zero value that can be represented by a single-precision IEEE decimal floating-point value.

  10⁻¹⁰⁰ to 10⁻³⁰

• Mathematics: The chances of shuffling a standard 52-card deck in any specific order is around 1.24
• Computing: The number 1.4 is approximately equal to the smallest positive non-zero value that can be represented by a single-precision IEEE floating-point value.

  10⁻³⁰

• Mathematics: The probability in a game of bridge of all four players getting a complete suit each is approximately.

  10⁻²⁷

10⁻²⁴

10⁻²¹

• Mathematics: The probability of matching 20 numbers for 20 in a game of keno is approximately 2.83 × 10⁻¹⁹.

  10⁻¹⁸

• Mathematics: The probability of rolling snake eyes 10 times in a row on a pair of fair dice is about.

  10⁻¹⁵

• Mathematics: The Ramanujan constant, is an almost integer, differing from the nearest integer by approximately.

  10⁻¹²

• Mathematics: The probability in a game of bridge of one player getting a complete suit is approximately .
• Biology: Human visual sensitivity to 1000 nm light is approximately of its peak sensitivity at 555 nm.

  10⁻⁹

• Mathematics – Lottery: The odds of winning the Grand Prize in the US Powerball lottery, with a single ticket, under the rules, are 292,201,338 to 1 against, for a probability of .
• Mathematics – Lottery: The odds of winning the Grand Prize in the Australian Powerball lottery, with a single ticket, under the rules, are 134,490,400 to 1 against, for a probability of .
• Mathematics – Lottery: The odds of winning the Jackpot in the UK National Lottery, with a single ticket, under the rules, are 13,983,815 to 1 against, for a probability of .

  10⁻⁶

• Mathematics – Poker: The odds of being dealt a royal flush in poker are 649,739 to 1 against, for a probability of 1.5.
• Mathematics – Poker: The odds of being dealt a straight flush in poker are 72,192 to 1 against, for a probability of 1.4.
• Mathematics – Poker: The odds of being dealt a four of a kind in poker are 4,164 to 1 against, for a probability of 2.4 .

  10⁻³

• Mathematics – Poker: The odds of being dealt a full house in poker are 693 to 1 against, for a probability of 1.4 × 10⁻³.
• Mathematics – Poker: The odds of being dealt a flush in poker are 507.8 to 1 against, for a probability of 1.9 × 10⁻³.
• Mathematics – Poker: The odds of being dealt a straight in poker are 253.8 to 1 against, for a probability of 4 × 10⁻³.
• Physics: α =, the fine-structure constant.

  10⁻²

• Mathematics – Lottery: The odds of winning any prize in the UK National Lottery, with a single ticket, under the rules as of 2003, are 54 to 1 against, for a probability of about 0.018.
• Mathematics – Poker: The odds of being dealt a three of a kind in poker are 46 to 1 against, for a probability of 0.021.
• Mathematics – Lottery: The odds of winning any prize in the Powerball, with a single ticket, under the rules as of 2015, are 24.87 to 1 against, for a probability of 0.0402.
• Mathematics – Poker: The odds of being dealt two pair in poker are 20 to 1 against, for a probability of 0.048.

  10⁻¹

• Legal history: 10% was widespread as the tax raised for income or produce in the ancient and medieval period; see tithe.
• Mathematics – Poker: The odds of being dealt only one pair in poker are about 5 to 2 against, for a probability of 0.42.
• Mathematics – Poker: The odds of being dealt no pair in poker are nearly 1 to 2, for a probability of about 0.5.

  10⁰

• Demography: The population of Monowi, an incorporated village in Nebraska, United States, was one in 2010.
• Religion: One is the number of gods in Judaism, Christianity, and Islam
• Mathematics: Square root of 2| ≈, the ratio of the diagonal of a square to its side length.
• Mathematics: φ ≈, the golden ratio.
• Mathematics: Square root of 3| ≈, the ratio of the diagonal of a unit cube.
• Mathematics: the number system understood by most computers, the binary system, uses 2 digits: 0 and 1.
• Mathematics: √5 ≈ 2.236 067 9775, the correspondant to the diagonal of a rectangle whose side lengths are 1 and 2.
• Mathematics: e ≈, the base of the natural logarithm.
• Mathematics: the number system understood by ternary computers, the ternary system, uses 3 digits: 0, 1, and 2.
• Mathematics: π ≈, the ratio of a circle's circumference to its diameter.
• Religion: The Four Noble Truths in Buddhism.
• Biology: 7 ± 2, in cognitive science, George A. Miller's estimate of the number of objects that can be simultaneously held in human working memory.
• Music: 7 notes in a major or minor scale.
• Astronomy: 8 planets in the Solar System.
• Religion: the Eightfold Path in Buddhism.
• Literature: 9 circles of Hell in Inferno by Dante Alighieri.

  10¹

• Demography: The population of Pesnopoy, a village in Bulgaria, was 10 in 2007.
• Human scale: There are 10 digits on a pair of human hands, and 10 toes on a pair of human feet.
• Mathematics: The number system used in everyday life, the decimal system, has 10 digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9.
• Religion: the Ten Commandments in Judaism and Christianity
• Music: The number of notes in a chromatic scale.
• Music: The number of completed, numbered string quartets by Ludwig van Beethoven and Dmitri Shostakovich
• Linguistics: The Finnish language has fifteen noun cases.
• Mathematics: The hexadecimal system, a common number system used in computer programming, uses 16 digits where the last 6 are usually represented by letters: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F.
• Science Fiction: The 23 enigma plays a prominent role in the plot of The Illuminatus! Trilogy by Robert Shea and Robert Anton Wilson.
• Music: a combined total of 24 major and minor keys, also the number of works in some musical cycles of J. S. Bach, Frédéric Chopin, Alexander Scriabin, and Dmitri Shostakovich.
• Alphabetic writing: There are 26 letters in the Latin-derived English alphabet.
• Science Fiction: The number 42, in by Douglas Adams, is the Answer to the Ultimate Question of Life, the Universe, and Everything which is calculated by an enormous supercomputer over a period of 7.5 million years.
• Biology: Each human cell contains 46 chromosomes.
• Phonology: There are 47 phonemes in English phonology in Received Pronunciation.
• Music: There are 88 keys on a grand piano.

  10²

• Demography: The population of Nassau Island, part of the Cook Islands, is around 100.
• Music: There are 104 numbered symphonies of Franz Josef Haydn.
• European history: Groupings of 100 homesteads was a common administrative unit in Northern Europe and Great Britain.
• Chemistry: 118 chemical elements have been discovered or synthesized as of 2016.
• Computing: There are 128 characters in the ASCII character set.
• Phonology: The Taa language is estimated to have between 130 and 164 distinct phonemes.
• Political Science: There were 193 member states of the United Nations as of 2011.
• Computing: A GIF image supports maximum 256 colors.
• Music: the highest number in the Köchel catalogue of works of Wolfgang Amadeus Mozart
• Demography: Vatican City, the least populous country, has an approximate population of 800 as of 2018.

  10³

• Demography: The population of Ascension Island is 1,122.
• Music: 1,128: number of known extant works by Johann Sebastian Bach recognized in the Bach-Werke-Verzeichnis as of 2017
• Typesetting: 2,000–3,000 letters on a typical typed page of text.
• Mathematics: 2,520 is the least common multiple of every positive integer under 10.
• Terrorism: 2,996 persons died in the terrorist attacks of September 11, 2001.
• Biology: the DNA of the simplest viruses has 3,000 base pairs.
• Military history: 4,200 or 5,200 was the standard size of a Roman legion.
• Linguistics: Estimates for the linguistic diversity of living human languages or dialects range between 5,000 and 10,000.
• Astronomy — Catalogues: There are 7,840 deep-sky objects in the NGC Catalogue from 1888.
• Lexicography: 8,674 unique words in the Hebrew Bible.

  10⁴

• Biology: Each neuron in the human brain is estimated to connect to 10,000 others.
• Demography: The population of Tuvalu was 10,544 in 2007.
• Lexicography: 14,500 unique English words occur in the King James Version of the Bible.
• Language: There are 20,000–40,000 distinct Chinese characters.
• Biology: Each human being is estimated to have 20,000 coding genes.
• Grammar: Each regular verb in Cherokee can have 21,262 inflected forms.
• Mathematics: 65,537 is the largest known Fermat prime.
• Memory:, the largest number of decimal places of π that have been recited from memory is 70,030.

  10⁵

• Demography: The population of Saint Vincent and the Grenadines was 100,982 in 2009.
• Biology – Strands of hair on a head: The average human head has about 100,000–150,000 strands of hair.
• Literature: approximately 100,000 verses in the Mahabharata.
• Language: 267,000 words in James Joyce's Ulysses.
• Mathematics: 294,000 – The approximate number of entries in The On-Line Encyclopedia of Integer Sequences.
• Genocide: 300,000 people killed in the Rape of Nanking.
• Language – English words: The New Oxford Dictionary of English contains about 360,000 definitions for English words.
• Literature: 564,000 words in War and Peace by Leo Tolstoy.
• Literature: 930,000 words in the King James Version of the Bible.
• Mathematics: There are 933,120 possible combinations on the Pyraminx.

  10⁶

• Demography: The population of Riga, Latvia was 1,003,949 in 2004, according to Eurostat.
• Biology – Species: The World Resources Institute claims that approximately 1.4 million species have been named, out of an unknown number of total species. Some scientists give 8.8 million species as an exact figure.
• Genocide: Approximately 800,000–1,500,000 Armenians were killed in the Armenian Genocide.
• Linguistics: The number of possible conjugations for each verb in the Archi language is 1,502,839.
• Info: The freedb database of CD track listings has around 1,750,000 entries.
• War: 1,857,619 casualties at the Battle of Stalingrad.
• Mathematics – Playing cards: There are 2,598,960 different 5-card poker hands that can be dealt from a standard 52-card deck.
• Mathematics: There are 3,149,280 possible positions for the Skewb.
• Mathematics -Rubik's Cube: 3,674,160 is the number of combinations for the Pocket Cube.
• Info – Web sites: As of ,, Wikipedia contains approximately articles in the English language.
• Geography/Computing – Geographic places: The NIMA GEOnet Names Server contains approximately 3.88 million named geographic features outside the United States, with 5.34 million names. The USGS Geographic Names Information System claims to have almost 2 million physical and cultural geographic features within the United States.
• Genocide: Approximately 5,100,000–6,200,000 Jews were killed in the Holocaust.

  10⁷

• Demography: The population of Haiti was 10,085,214 in 2010.
• Genocide: an estimated 12 million persons shipped from Africa to the New World in the Atlantic slave trade.
• Mathematics: 12,988,816 is the number of domino tilings of an 8×8 checkerboard.
• Computing: 16,777,216 different colors can be generated using the hex code system in HTML.
• Science Fiction: In Isaac Asimov's Galactic Empire, in 22,500 CE, there are 25,000,000 different inhabited planets in the Galactic Empire, all inhabited by humans in Asimov's "human galaxy" scenario.
• Internet – YouTube: There are estimated to be about 31 million YouTube channels with at least five subscribers, posting 500 hours of video every minute.
• Literature: Wikipedia contains a total of around 54 million articles in 300 languages.

  10⁸

• Demography: The population of the Philippines was 100,981,437 in 2015.
• Info – Books: The British Library claims that it holds over 150 million items. The Library of Congress claims that it holds approximately 148 million items. See The Gutenberg Galaxy.
• Mathematics: More than 215,000,000 mathematical constants are collected on the Plouffe's Inverter.
• Mathematics: 275,305,224 is the number of 5×5 normal magic squares, not counting rotations and reflections. This result was found in 1973 by Richard Schroeppel.
• Mathematics: 358,833,097 stellations of the rhombic triacontahedron.
• Info – Web sites:, the Netcraft web survey estimates that there are 525,998,433 distinct websites.
• Astronomy – Cataloged stars: The Guide Star Catalog II has entries on 998,402,801 distinct astronomical objects.

  10⁹

• Demography: The population of Africa reached 1,000,000,000 sometime in 2009.
• Demographics – India: 1,381,000,000 – approximate population of India in 2020.
• Transportation – Cars:, there are approximately 1.4 billion cars in the world, corresponding to around 18% of the human population.
• Demographics – China: 1,439,000,000 – approximate population of the People's Republic of China in 2020.
• Internet: Approximately 1,500,000,000 active users were on Facebook as of October 2015.
• Computing – Computational limit of a 32-bit CPU: 2,147,483,647 is equal to 2³¹−1, and as such is the largest number which can fit into a signed 32-bit integer on a computer.
• Biology – base pairs in the genome: approximately 3 base pairs in the human genome.
• Linguistics: 3,400,000,000 – the total number of speakers of Indo-European languages, of which 2,400,000,000 are native speakers; the other 1,000,000,000 speak Indo-European languages as a second language.
• Mathematics and computing: 4,294,967,295, the product of the five known Fermat primes and the maximum value for a 32-bit unsigned integer in computing.
• Computing – IPv4: 4,294,967,296 possible unique IP addresses.
• Computing: 4,294,967,296 – the number of bytes in 4 gibibytes; in computation, 32-bit computers can directly access 2³² units of address space, which leads directly to the 4-gigabyte limit on main memory.
• Mathematics: 4,294,967,297 is a Fermat number and semiprime. It is the smallest number of the form which is not a prime number.
• Demographics – world population: 7,750,000,000 – Estimated population for the world as of April 2020.

  10¹⁰

• Biology – bacteria in the human body: There are roughly 10¹⁰ bacteria in the human mouth.
• Computing – web pages: approximately 5.6 web pages indexed by Google as of 2010.

  10¹¹

• Biology – Neurons in the brain: approximately × 10¹¹ neurons in the human brain.
• Paleodemography – "Number of humans that have ever lived": approximately × 10¹¹ live births of anatomically modern humans since the beginning of the Upper Paleolithic.
• Astronomy – stars in our galaxy: of the order of 10¹¹ stars in the Milky Way galaxy.

  10¹²

• Astronomy: Andromeda Galaxy, which is part of the same Local Group as our galaxy, contains about 10¹² stars.
• Biology – Bacteria on the human body: The surface of the human body houses roughly 10¹² bacteria.
• Astronomy – Galaxies: A 2016 estimate says there are 2 × 10¹² galaxies in the observable universe.
• Biology: An estimate says there were 3.04 × 10¹² trees on Earth in 2015.
• Marine biology: 3,500,000,000,000 – estimated population of fish in the ocean.
• .Mathematics: 7,625,597,484,987 – a number that often appears when dealing with powers of 3. It can be expressed as,,, and ³3 or when using Knuth's up-arrow notation it can be expressed as and.
• Mathematics: 10¹³ – The approximate number of known non-trivial zeros of the Riemann zeta function.
• Mathematics – Known digits of π:, the number of known digits of π is 31,415,926,535,897.
• Biology – approximately 10¹⁴ synapses in the human brain.
• Astronomy: IC 1101, a supergiant elliptical galaxy located inside the Abell 2029 cluster, is estimated to have approximately 100 trillion stars inside the galaxy, making it the largest known galaxy in the Universe.
• Biology – Cells in the human body: The human body consists of roughly 10¹⁴ cells, of which only 10¹³ are human. The remaining 90% non-human cells are bacteria, which mostly reside in the gastrointestinal tract, although the skin is also covered in bacteria.
• Cryptography: 150,738,274,937,250 configurations of the plug-board of the Enigma machine used by the Germans in WW2 to encode and decode messages by cipher.
• Computing – MAC-48: 281,474,976,710,656 possible unique physical addresses.
• Mathematics: 953,467,954,114,363 is the largest known Motzkin prime.

  10¹⁵

• Biology-Insects: 1,000,000,000,000,000 to 10,000,000,000,000,000 – The estimated total number of ants on Earth alive at any one time.
• Computing: 9,007,199,254,740,992 – number until which all integer values can exactly be represented in IEEE double precision floating-point format.
• Mathematics: 48,988,659,276,962,496 is the fifth taxicab number.
• Science Fiction: In Isaac Asimov's Galactic Empire, in what we call 22,500 CE there are 25,000,000 different inhabited planets in the Galactic Empire, all inhabited by humans in Asimov's "human galaxy" scenario, each with an average population of 2,000,000,000, thus yielding a total Galactic Empire population of approximately 50,000,000,000,000,000.
• Cryptography: There are 2⁵⁶ = 72,057,594,037,927,936 different possible keys in the obsolete 56-bit DES symmetric cipher.

  10¹⁸

• Mathematics: Goldbach's conjecture has been verified for all n ≤ 4; that is, all prime numbers up to that value at least have been computed, but not necessarily stored.
• Computing – Manufacturing: An estimated 6 transistors were produced worldwide in 2008.
• Computing – Computational limit of a 64-bit CPU: 9,223,372,036,854,775,807 is equal to 2⁶³−1, and as such is the largest number which can fit into a signed 64-bit integer on a computer.
• Mathematics – NCAA Basketball Tournament: There are 9,223,372,036,854,775,808 possible ways to enter the bracket.
• Mathematics – Bases: 9,439,829,801,208,141,318 is the 10th and largest number with more than one digit that can be written from base 2 to base 18 using only the digits 0 to 9, meaning the digits for 10 to 17 are not needed in bases above 10.
• Biology – Insects: It has been estimated that the insect population of the Earth is about 10¹⁹.
• Mathematics – Answer to the wheat and chessboard problem: When doubling the grains of wheat on each successive square of a chessboard, beginning with one grain of wheat on the first square, the final number of grains of wheat on all 64 squares of the chessboard when added up is 2⁶⁴−1 = 18,446,744,073,709,551,615.
• Mathematics – Legends: In the legend called the Tower of Brahma about a Hindu temple which contains a large room with three posts on one of which is 64 golden discs, the object of the mathematical game is for the Brahmins in the temple to move all of the discs to another pole so that they are in the same order, never placing a larger disc above a smaller disc, moving only one at a time. It would take 2⁶⁴−1 = 18,446,744,073,709,551,615 turns to complete the task.
• Computing – IPv6: 18,446,744,073,709,551,616 possible unique /64 subnetworks.
• Mathematics – Rubik's Cube: There are 43,252,003,274,489,856,000 different positions of a 3×3×3 Rubik's Cube.
• Password strength: Usage of the 95-character set found on standard computer keyboards for a 10-character password yields a computationally intractable 59,873,693,923,837,890,625 permutations.
• Economics: Hyperinflation in Zimbabwe estimated in February 2009 by some economists at 10 sextillion percent, or a factor of 10²⁰

  10²¹

• Geo – Grains of sand: All the world's beaches combined have been estimated to hold roughly 10²¹ grains of sand.
• Computing – Manufacturing: Intel predicted that there would be 1.2 transistors in the world by 2015 and Forbes estimated that 2.9 transistors had been shipped up to 2014.
• Mathematics – Sudoku: There are 6,670,903,752,021,072,936,960 9×9 sudoku grids.
• Astronomy – Stars: 70 sextillion = 7, the estimated number of stars within range of telescopes.
• Astronomy – Stars: in the range of 10²³ to 10²⁴ stars in the observable universe.
• Mathematics: 146,361,946,186,458,562,560,000 is the fifth unitary perfect number.
• Chemistry – Physics: Avogadro constant is the number of constituents in one mole of a substance, defined for convenience as expressing the order of magnitude separating the molecular from the macroscopic scale.

  10²⁴

• Mathematics: 2,833,419,889,721,787,128,217,599 is a Woodall prime.
• Mathematics: 2⁸⁶ = 77,371,252,455,336,267,181,195,264 is the largest known power of two not containing the digit '0' in its decimal representation.

  10²⁷

• Biology – Atoms in the human body: the average human body contains roughly 7 atoms.
• Mathematics – Poker: the number of unique combinations of hands and shared cards in a 10-player game of Texas hold 'em is approximately 2.117.

  10³⁰

• Biology – Bacterial cells on Earth: The number of bacterial cells on Earth is estimated at around 5,000,000,000,000,000,000,000,000,000,000, or 5 × 10³⁰.
• Mathematics: The number of partitions of 1000 is 24,061,467,864,032,622,473,692,149,727,991.
• Mathematics: 3⁶⁸ = 278,128,389,443,693,511,257,285,776,231,761 is the largest known power of three not containing the digit '0' in its decimal representation.
• Mathematics: 2¹⁰⁸ = 324,518,553,658,426,726,783,156,020,576,256 is the largest known power of two not containing the digit '9' in its decimal representation.

  10³³

• Mathematics – Alexander's Star: There are 72,431,714,252,715,638,411,621,302,272,000,000 different positions of Alexander's Star.

  10³⁶

• Physics: k_e e² / Gm², the ratio of the electromagnetic to the gravitational forces between two protons, is roughly 10³⁶.
• Mathematics: = 170,141,183,460,469,231,731,687,303,715,884,105,727 is a double Mersenne prime.
• Computing: 2¹²⁸ = 340,282,366,920,938,463,463,374,607,431,768,211,456, the theoretical maximum number of Internet addresses that can be allocated under the IPv6 addressing system, one more than the largest value that can be represented by a single-precision IEEE floating-point value, the total number of different Universally Unique Identifiers that can be generated.
• Cryptography: 2¹²⁸ = 340,282,366,920,938,463,463,374,607,431,768,211,456, the total number of different possible keys in the AES 128-bit key space.

  10³⁹

• Cosmology: The Eddington–Dirac number is roughly 10⁴⁰.
• Mathematics: 69,720,375,229,712,477,164,533,808,935,312,303,556,800 is the least common multiple of every integer from 1 to 100.

  10⁴² to 10¹⁰⁰

• Mathematics: 141×2¹⁴¹+1 = 393,050,634,124,102,232,869,567,034,555,427,371,542,904,833 is the second Cullen prime.
• Mathematics: There are 7,401,196,841,564,901,869,874,093,974,498,574,336,000,000,000 possible permutations for the Rubik's Revenge.

• Chess: 4.52 is a proven upper bound for the number of legal chess positions.
• Geo: 1.33 is the estimated number of atoms in Earth.
• Mathematics: 808,017,424,794,512,875,886,459,904,961,710,757,005,754,368,000,000,000 is the order of the monster group.
• Cryptography: 2¹⁹² = 6,277,101,735,386,680,763,835,789,423,207,666,416,102,355,444,464,034,512,896, the total number of different possible keys in the AES 192-bit key space.
• Cosmology: 8 is roughly the number of Planck time intervals since the universe is theorised to have been created in the Big Bang 13.799 ± 0.021 billion years ago.
• Cosmology: 1 is Archimedes' estimate in The Sand Reckoner of the total number of grains of sand that could fit into the entire cosmos, the diameter of which he estimated in stadia to be what we call 2 light years.
• Mathematics – Cards: 52! = 80,658,175,170,943,878,571,660,636,856,403,766,975,289,505,440,883,277,824,000,000,000,000 – the number of ways to order the cards in a 52-card deck.
• Mathematics: There are ≈1.01×10⁶⁸ possible combinations for the Megaminx.
• Mathematics: 1,808,422,353,177,349,564,546,512,035,512,530,001,279,481,259,854,248,860,454,348,989,451,026,887 – The largest known prime factor found by ECM factorization.
• Mathematics: There are 282,870,942,277,741,856,536,180,333,107,150,328,293,127,731,985,672,134,721,536,000,000,000,000,000 possible permutations for the Professor's Cube.
• Cryptography: 2²⁵⁶ = 115,792,089,237,316,195,423,570,985,008,687,907,853,269,984,665,640,564,039,457,584,007,913,129,639,936, the total number of different possible keys in the AES 256-bit key space.
• Cosmology: Various sources estimate the total number of fundamental particles in the observable universe to be within the range of 10⁸⁰ to 10⁸⁵. However, these estimates are generally regarded as guesswork.
• Computing: 9.999 999 is equal to the largest value that can be represented in the IEEE decimal32 floating-point format.
• Computing: 69!, is the highest factorial value that can be represented on a calculator with two digits for powers of ten without overflow.
• Mathematics: One googol, 1, 1 followed by one hundred zeros, or 10,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000.

  10¹⁰⁰ (one [googol]) to 10¹⁰⁰⁰

• Mathematics: There are 157 152 858 401 024 063 281 013 959 519 483 771 508 510 790 313 968 742 344 694 684 829 502 629 887 168 573 442 107 637 760 000 000 000 000 000 000 000 000 distinguishable permutations of the V-Cube 6.
• Chess: Shannon number, 10¹²⁰, a lower bound of the game-tree complexity of chess.
• Physics: 10¹²⁰, discrepancy between the observed value of the cosmological constant and a naive estimate based on Quantum Field Theory and the Planck energy.
• Physics: 8, ratio of the mass-energy in the observable universe to the energy of a photon with a wavelength the size of the observable universe.
• History – Religion: Asaṃkhyeya is a Buddhist name for the number 10¹⁴⁰. It is listed in the Avatamsaka Sutra and metaphorically means "innumerable" in the Sanskrit language of ancient India.
• Xiangqi: 10¹⁵⁰, an estimation of the game-tree complexity of xiangqi.
• Mathematics: There are 19 500 551 183 731 307 835 329 126 754 019 748 794 904 992 692 043 434 567 152 132 912 323 232 706 135 469 180 065 278 712 755 853 360 682 328 551 719 137 311 299 993 600 000 000 000 000 000 000 000 000 000 000 000 distinguishable permutations of the V-Cube 7.
• Go: There are 208 168 199 381 979 984 699 478 633 344 862 770 286 522 453 884 530 548 425 639 456 820 927 419 612 738 015 378 525 648 451 698 519 643 907 259 916 015 628 128 546 089 888 314 427 129 715 319 317 557 736 620 397 247 064 840 935 legal positions in the game of Go. See Go and mathematics.
• Board games: 3.457, number of ways to arrange the tiles in English Scrabble on a standard 15-by-15 Scrabble board.
• Physics: 10¹⁸⁶, approximate number of Planck volumes in the observable universe.
• Physics: 7, approximate spacetime volume of the history of the observable universe in Planck units.
• Computing: 1.797 693 134 862 315 807 is approximately equal to the largest value that can be represented in the IEEE double precision floating-point format.
• Computing: is equal to the largest value that can be represented in the IEEE decimal64 floating-point format.

  10¹⁰⁰⁰ to 10¹⁰¹⁰⁰ (one [googolplex])

• Mathematics: There are approximately 1.869 distinguishable permutations of the world's largest Rubik's cube.
• Computing: 1.189 731 495 357 231 765 05 is approximately equal to the largest value that can be represented in the IEEE 80-bit x86 extended precision floating-point format.
• Computing: 1.189 731 495 357 231 765 085 759 326 628 007 0 is approximately equal to the largest value that can be represented in the IEEE quadruple precision floating-point format.
• Computing: is equal to the largest value that can be represented in the IEEE decimal128 floating-point format.
• Computing: 10^10,000 − 1 is equal to the largest value that can be represented in Windows Phone's calculator.
• Mathematics: 2638⁴⁴⁰⁵ + 4405²⁶³⁸ is a 15,071-digit Leyland prime; the largest which has been proven.
• Mathematics: 3,756,801,695,685 × 2^666,669 ± 1 are 200,700-digit twin primes; the largest known.
• Mathematics: 18,543,637,900,515 × 2^666,667 − 1 is a 200,701-digit Sophie Germain prime; the largest known.
• Mathematics: approximately 7.76 × 10^206,544 cattle in the smallest herd which satisfies the conditions of Archimedes' cattle problem.
• Mathematics: 10^290,253 – 2 × 10^145,126 + 1 is a 290,253-digit palindromic prime, the largest known.
• Mathematics: 1,098,133# – 1 is a 476,311-digit primorial prime; the largest known.
• Mathematics: 150,209! + 1 is a 712,355-digit factorial prime; the largest known.
• Mathematics – Literature: Jorge Luis Borges' Library of Babel contains at least 25^1,312,000 ≈ 1.956 × 10^1,834,097 books.
• Mathematics: 475,856^524,288 + 1 is a 2,976,633-digit Generalized Fermat prime, the largest known.
• Mathematics: 19,249 × 2^13,018,586 + 1 is a 3,918,990-digit Proth prime, the largest known Proth prime and non-Mersenne prime.
• Mathematics: 2^82,589,933 − 1 is a 24,862,048-digit Mersenne prime; the largest known prime of any kind.
• Mathematics: 2^82,589,932 × is a 49,724,095-digit perfect number, the largest known as of 2019.
• Mathematics – History: 10^8×1016, largest named number in Archimedes' Sand Reckoner.
• Mathematics: 10^googol, a googolplex. A number 1 followed by 1 googol zeros. Carl Sagan has estimated that 1 googolplex, fully written out, would not fit in the observable universe because of its size, while also noting that one could also write the number as 10¹⁰¹⁰⁰.

  Larger than 10¹⁰¹⁰⁰

• Mathematics–Literature: The number of different ways in which the books in Jorge Luis Borges' Library of Babel can be arranged is, the factorial of the number of books in the Library of Babel.
• Cosmology: In chaotic inflation theory, proposed by physicist Andrei Linde, our universe is one of many other universes with different physical constants that originated as part of our local section of the multiverse, owing to a vacuum that had not decayed to its ground state. According to Linde and Vanchurin, the total number of these universes is about.
• Mathematics:, order of magnitude of an upper bound that occurred in a proof of Skewes.
• Cosmology: The estimated number of Planck time units for quantum fluctuations and tunnelling to generate a new Big Bang is estimated to be.
• Mathematics:, a number in the googol family called a googolplexplex, googolplexian, or googolduplex. 1 followed by a googolplex zeros, or 10^googolplex
• Mathematics:, order of magnitude of another upper bound in a proof of Skewes.
• Mathematics: Steinhaus' mega lies between 10↑↑257 and 10↑↑258.
• Mathematics: Moser's number, "2 in a mega-gon" in Steinhaus–Moser notation, is approximately equal to 10↑↑↑...↑↑↑10, where there are 10↑↑257 arrows, the last four digits are...1056.
• Mathematics: Graham's number, the last ten digits of which are...2464195387. Arises as an upper bound solution to a problem in Ramsey theory. Representation in powers of 10 would be impractical.
• Mathematics: TREE: appears in relation to a theorem on trees in graph theory. Representation of the number is difficult, but one weak lower bound is A^A, where A is a version of the Ackermann function.
• Mathematics: SSCG: appears in relation to the Robertson–Seymour theorem. Known to be greater than both TREE and TREE times with TREE.