81521133636627864

Names of 81521133636627864

• Cardinal: 81521133636627864 can be written as Eighty-one quadrillion, five hundred twenty-one trillion, one hundred thirty-three billion, six hundred thirty-six million, six hundred twenty-seven thousand, eight hundred sixty-four.

Scientific notation

• Scientific notation: 8.1521133636627864 × 10¹⁶

Factors of 81521133636627864

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 13
• Sum of prime factors: 657

Divisors of 81521133636627864

• Number of divisors d(n): 320
• Complete list of divisors:
  1 2 3 4 6 8 9 12 18 24 27 36 54 72 81 89 108 162 178 216 267 324 356 534 563 648 712 801 1068 1126 1602 1689 2136 2252 2403 3204 3378 4504 4806 5067 6408 6756 7209 7921 9612 10134 13512 14418 15201 15842 19224 20268 23763 28836 30402 31684 40536 45603 47526 50107 57672 60804 63368 71289 91206 95052 100214 121608 142578 150321 182412 190104 200428 213867 285156 300642 316969 364824 400856 427734 450963 570312 601284 633938 641601 704969 855468 901926 950907 1202568 1267876 1283202 1352889 1409938 1710936 1803852 1901814 2114907 2535752 2566404 2705778 2819876 2852721 3607704 3803628 4058667 4229814 4459523 5132808 5411556 5639752 5705442 6344721 7607256 8117334 8459628 8558163 8919046 10823112 11410884 12689442 13378569 16234668 16919256 17116326 17838092 19034163 22821768 25378884 25674489 26757138 28210241 32469336 34232652 35676184 38068326 40135707 50757768 51348978 53514276 56420482 57102489 68465304 76136652 80271414 84630723 102697956 107028552 112840964 114204978 120407121 152273304 160542828 169261446 178453547 205395912 225681928 228409956 240814242 253892169 321085656 338522892 356907094 361221363 396897547 456819912 481628484 507784338 535360641 677045784 713814188 722442726 761676507 793795094 963256968 1015568676 1070721282 1190692641 1427628376 1444885452 1523353014 1587590188 1606081923 2031137352 2141442564 2285029521 2381385282 2510711449 2889770904 3046706028 3175180376 3212163846 3572077923 4282885128 4570059042 4762770564 4818245769 5021422898 6093412056 6424327692 7144155846 7532134347 9140118084 9525541128 9636491538 10042845796 10716233769 12848655384 14288311692 14454737307 15064268694 15882365683 18280236168 19272983076 20085691592 21432467538 22596403041 28576623384 28909474614 30128537388 31764731366 32148701307 38545966152 42864935076 45192806082 47647097049 57818949228 60257074776 63529462732 64297402614 67789209123 85729870152 90385612164 95294194098 115637898456 127058925464 128594805228 135578418246 142941291147 180771224328 190588388196 203367627369 223453318961 257189610456 271156836492 285882582294 381176776392 406735254738 428823873441 446906637922 542313672984 571765164588 670359956883 813470509476 857647746882 893813275844 1143530329176 1286471620323 1340719913766 1413530545787 1626941018952 1715295493764 1787626551688 2011079870649 2572943240646 2681439827532 2827061091574 3430590987528 4022159741298 4240591637361 5145886481292 5362879655064 5654122183148 6033239611947 8044319482596 8481183274722 10291772962584 11308244366296 12066479223894 12721774912083 16088638965192 16962366549444 18099718835841 24132958447788 25443549824166 33924733098888 36199437671682 38165324736249 48265916895576 50887099648332 72398875343364 76330649472498 101774199296664 114495974208747 125804218575043 144797750686728 152661298944996 228991948417494 251608437150086 305322597889992 377412655725129 457983896834988 503216874300172 754825311450258 915967793669976 1006433748600344 1132237967175387 1509650622900516 2264475934350774 3019301245801032 3396713901526161 4528951868701548 6793427803052322 9057903737403096 10190141704578483 13586855606104644 20380283409156966 27173711212209288 40760566818313932 81521133636627864
• Sum of all divisors σ(n): 231340271382396000
• Sum of proper divisors (its aliquot sum) s(n): 149819137745768136
• 81521133636627864 is an abundant number, because the sum of its proper divisors (149819137745768136) is greater than itself. Its abundance is 68298004109140272

Bases of 81521133636627864

• Binary: 100100001100111110000101000000100000110010010110110011000₂
• Hexadecimal: 0x1219F0A04192D98
• Base-36: MAOTVS9Y9I0

Squares and roots of 81521133636627864

• 81521133636627864 squared (81521133636627864²) is 6645695229400938950594861221202496
• 81521133636627864 cubed (81521133636627864³) is 541764608904294213204833874441799124978544539948544
• The square root of 81521133636627864 is 285519060.0233684295
• The cube root of 81521133636627864 is 433600.7953163599

Scales and comparisons

• 81,521,133,636,627,864 seconds is equal to 2,592,119,888 years, 11 weeks, 3 days, 19 hours, 44 minutes, 24 seconds.
• To count from 1 to 81,521,133,636,627,864 would take you about seven billion, seven hundred seventy-six million, three hundred fifty-nine thousand, six hundred sixty-four 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 81521133636627864 cubic inches would be around 36133.4 feet tall.

Recreational maths with 81521133636627864

• 81521133636627864 backwards is 46872663633112518
• 81521133636627864 is a Harshad number.
• The number of decimal digits it has is: 17
• The sum of 81521133636627864's digits is 72
• More coming soon!