81391667018816

Names of 81391667018816

• Cardinal: 81391667018816 can be written as Eighty-one trillion, three hundred ninety-one billion, six hundred sixty-seven million, eighteen thousand, eight hundred sixteen.

Scientific notation

• Scientific notation: 8.1391667018816 × 10¹³

Factors of 81391667018816

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 12
• Sum of prime factors: 1916

Divisors of 81391667018816

• Number of divisors d(n): 448
• Complete list of divisors:
  1 2 4 7 8 11 14 16 22 28 32 44 56 64 77 88 112 149 154 176 181 224 298 308 352 362 448 596 616 704 724 757 809 1043 1192 1232 1267 1448 1514 1618 1639 1991 2086 2384 2464 2534 2896 3028 3236 3278 3982 4172 4768 4928 5068 5299 5663 5792 6056 6472 6556 7964 8327 8344 8899 9536 10136 10598 11326 11473 11584 12112 12944 13112 13937 15928 16654 16688 17798 20272 21196 22652 22946 24224 25888 26224 26969 27874 31856 33308 33376 35596 40544 42392 45304 45892 48448 51776 52448 53938 55748 58289 62293 63712 66616 66752 71192 81088 84784 90608 91784 104896 107876 111496 112793 116578 120541 124586 127424 133232 137017 142384 146429 169568 181216 183568 188783 215752 222992 225586 233156 241082 249172 266464 274034 284768 292858 296659 339136 362432 367136 377566 431504 445984 451172 466312 482164 498344 532928 548068 569536 585716 593318 612413 734272 755132 789551 843787 863008 891968 902344 932624 959119 964328 996688 1025003 1096136 1171432 1186636 1224826 1240723 1325951 1507187 1510264 1579102 1610719 1687574 1726016 1804688 1865248 1918238 1928656 1993376 2050006 2076613 2192272 2342864 2373272 2449652 2481446 2651902 3014374 3020528 3158204 3221438 3375148 3609376 3730496 3836476 3857312 3986752 4100012 4153226 4286891 4384544 4685728 4746544 4899304 4962892 5303804 6028748 6041056 6316408 6442876 6736543 6750296 7218752 7672952 7714624 8200024 8306452 8573782 8685061 8769088 9281657 9371456 9493088 9798608 9925784 10550309 10607608 11275033 12057496 12082112 12632816 12885752 13473086 13500592 15345904 16400048 16612904 17147564 17370122 18563314 18986176 19597216 19851568 20415533 21100618 21215216 21817921 22550066 24114992 25265632 25771504 26946172 27001184 30691808 32800096 33225808 34295128 34740244 37126628 39194432 39703136 40831066 42201236 42430432 43635842 45100132 47155801 48229984 50531264 51543008 53892344 54002368 61383616 65600192 66451616 68590256 69480488 74253256 79406272 81662132 84402472 84860864 87271684 90200264 91249537 94311602 96459968 103086016 107784688 110846753 132903232 137180512 138960976 142908731 148506512 152725447 163324264 168804944 174543368 180400528 182499074 188623204 215569376 221693506 224570863 239997131 274361024 277921952 285817462 297013024 305450894 326648528 337609888 349086736 360801056 364998148 377246408 431138752 443387012 449141726 479994262 555843904 571634924 594026048 610901788 638746759 653297056 675219776 698173472 721602112 729996296 754492816 775927271 886774024 898283452 959988524 1003744907 1143269848 1219314283 1221803576 1277493518 1306594112 1396346944 1459992592 1508985632 1551854542 1571996041 1679979917 1773548048 1796566904 1919977048 2007489814 2286539696 2438628566 2443607152 2554987036 2919985184 3017971264 3103709084 3143992082 3359959834 3547096096 3593133808 3839954096 4014979628 4573079392 4877257132 4887214304 5109974072 5839970368 6207418168 6287984164 6719919668 7026214349 7094192192 7186267616 7679908192 8029959256 8535199981 9146158784 9754514264 9774428608 10219948144 12414836336 12575968328 13439839336 14052428698 14372535232 15359816384 16059918512 16516166197 17070399962 19509028528 20439896288 24829672672 25151936656 26879678672 28104857396 32119837024 33032332394 34140799924 39018057056 40879792576 49659345344 50303873312 53759357344 56209714792 64239674048 66064664788 68281599848 78036114112 100607746624 107518714688 112419429584 115613163379 132129329576 136563199696 181677828167 224838859168 231226326758 264258659152 273126399392 363355656334 449677718336 462452653516 528517318304 546252798784 726711312668 924905307032 1057034636608 1271744797169 1453422625336 1849810614064 2543489594338 2906845250672 3699621228128 5086979188676 5813690501344 7399242456256 10173958377352 11627381002688 20347916754704 40695833509408 81391667018816
• Sum of all divisors σ(n): 204358085568000
• Sum of proper divisors (its aliquot sum) s(n): 122966418549184
• 81391667018816 is an abundant number, because the sum of its proper divisors (122966418549184) is greater than itself. Its abundance is 41574751530368

Bases of 81391667018816

• Binary: 10010100000011001111001011001100111110001000000₂
• Hexadecimal: 0x4A0679667C40
• Base-36: SUMTD2LVK

Squares and roots of 81391667018816

• 81391667018816 squared (81391667018816²) is 6624603460101820212898041856
• 81391667018816 cubed (81391667018816³) is 539187518956303675567342376821503507562496
• The square root of 81391667018816 is 9021733.0385473057
• The cube root of 81391667018816 is 43337.1134737053

Scales and comparisons

• 81,391,667,018,816 seconds is equal to 2,588,003 years, 13 weeks, 2 hours, 6 minutes, 56 seconds.
• To count from 1 to 81,391,667,018,816 would take you about six million, four hundred seventy thousand and eight years!

  This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)

• A cube with a volume of 81391667018816 cubic inches would be around 3611.4 feet tall.

Recreational maths with 81391667018816

• 81391667018816 backwards is 61881076619318
• The number of decimal digits it has is: 14
• The sum of 81391667018816's digits is 65
• More coming soon!