81721836039168

Names of 81721836039168

• Cardinal: 81721836039168 can be written as Eighty-one trillion, seven hundred twenty-one billion, eight hundred thirty-six million, thirty-nine thousand, one hundred sixty-eight.

Scientific notation

• Scientific notation: 8.1721836039168 × 10¹³

Factors of 81721836039168

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 17
• Sum of prime factors: 4251

Divisors of 81721836039168

• Number of divisors d(n): 792
• Complete list of divisors:
  1 2 3 4 6 8 9 12 13 16 18 24 26 31 32 36 39 48 52 62 64 72 73 78 93 96 104 117 124 128 144 146 156 186 192 208 219 234 248 256 279 288 292 312 372 384 403 416 438 468 496 512 558 576 584 624 657 744 768 806 832 876 936 949 992 1024 1116 1152 1168 1209 1248 1314 1488 1536 1612 1664 1752 1872 1898 1984 2232 2263 2304 2336 2418 2496 2628 2847 2976 3072 3224 3328 3504 3627 3744 3796 3968 4129 4464 4526 4608 4672 4836 4992 5256 5329 5694 5952 6448 6656 6789 7008 7254 7488 7592 7936 8258 8541 8928 9052 9216 9344 9672 9984 10512 10658 11388 11904 12387 12896 13312 13578 14016 14508 14976 15184 15872 15987 16516 17082 17856 18104 18688 19344 19968 20367 21024 21316 22776 23808 24774 25792 27156 28032 29016 29419 29952 30368 31744 31974 33032 34164 35712 36208 37161 37376 38688 39936 40734 42048 42632 45552 47616 47961 49548 51584 53677 54312 56064 58032 58838 59904 60736 63948 66064 68328 69277 71424 72416 74322 74752 77376 81468 84096 85264 88257 91104 95232 95922 99096 103168 107354 108624 112128 116064 117676 119808 121472 127896 127999 132128 136656 138554 142848 144832 148644 154752 161031 162936 165199 168192 170528 176514 182208 191844 198192 206336 207831 214708 217248 224256 232128 235352 242944 255792 255998 264256 264771 273312 277108 285696 289664 297288 301417 309504 322062 325872 330398 336384 341056 353028 364416 383688 383997 396384 412672 415662 429416 434496 464256 470704 483093 485888 495597 511584 511996 528512 529542 546624 554216 579328 594576 602834 619008 623493 644124 651744 660796 672768 682112 706056 728832 767376 767994 792768 831324 858832 868992 904251 928512 941408 966186 971776 991194 1023168 1023992 1057024 1059084 1093248 1108432 1151991 1158656 1189152 1205668 1238016 1246986 1288248 1303488 1321592 1364224 1412112 1457664 1486791 1534752 1535988 1585536 1662648 1663987 1717664 1737984 1808502 1857024 1882816 1932372 1982388 2046336 2047984 2114048 2118168 2147587 2186496 2216864 2303982 2317312 2378304 2411336 2493972 2576496 2606976 2643184 2712753 2728448 2824224 2915328 2973582 3069504 3071976 3171072 3325296 3327974 3435328 3475968 3617004 3714048 3765632 3864744 3918421 3964776 4092672 4095968 4228096 4236336 4295174 4372992 4433728 4607964 4756608 4822672 4987944 4991961 5152992 5213952 5286368 5425506 5456896 5648448 5947164 6139008 6143952 6342144 6442761 6650592 6655948 6870656 6951936 7234008 7531264 7729488 7836842 7929552 8185344 8191936 8472672 8590348 8745984 8867456 9215928 9343927 9513216 9645344 9975888 9983922 10305984 10427904 10572736 10851012 11296896 11755263 11894328 12278016 12287904 12684288 12885522 13301184 13311896 13741312 14468016 14975883 15062528 15458976 15673684 15859104 16370688 16383872 16945344 17180696 17734912 18431856 18687854 19026432 19290688 19328283 19951776 19967844 20611968 20855808 21145472 21702024 22003441 22593792 23510526 23788656 24556032 24575808 25771044 26602368 26623792 27482624 28031781 28936032 29951766 30125056 30917952 31347368 31718208 32767744 33890688 34361392 35265789 35469824 36863712 37375708 38052864 38581376 38656566 39903552 39935688 41223936 42290944 43404048 44006882 45187584 47021052 47577312 49112064 49151616 51542088 53204736 53247584 54965248 56063562 57872064 59903532 61835904 62694736 63436416 65535488 66010323 67781376 68722784 70531578 70939648 73727424 74751416 77162752 77313132 79807104 79871376 82447872 84095343 84581888 86808096 88013764 90375168 94042104 95154624 98303232 103084176 106409472 106495168 112127124 115744128 119807064 121471051 123671808 125389472 126872832 131070976 132020646 135562752 137445568 141063156 147454848 149502832 154325504 154626264 159614208 159742752 164895744 168190686 169163776 173616192 176027528 188084208 190309248 196606464 198030969 206168352 212818944 212990336 224254248 231488256 239614128 242942102 247343616 250778944 253745664 264041292 271125504 274891136 282126312 286044733 294909696 299005664 308651008 309252528 319228416 319485504 336381372 347232384 352055056 364413153 376168416 380618496 393212928 396061938 412336704 425980672 448508496 462976512 479228256 485884204 494687232 501557888 507491328 528082584 549782272 564252624 572089466 589819392 598011328 618505056 638456832 638971008 672762744 682106671 694464768 704110112 728826306 752336832 761236992 792123876 824673408 851961344 858134199 897016992 925953024 958456512 971768408 1003115776 1056165168 1093239459 1099564544 1128505248 1144178932 1179638784 1196022656 1237010112 1277942016 1345525488 1364213342 1388929536 1408220224 1457652612 1504673664 1522473984 1584247752 1649346816 1703922688 1716268398 1794033984 1916913024 1943536816 2006231552 2046320013 2112330336 2186478918 2199129088 2257010496 2288357864 2392045312 2474020224 2555884032 2574402597 2691050976 2728426684 2777859072 2816440448 2915305224 3009347328 3168495504 3298693632 3432536796 3588067968 3833826048 3887073632 4012463104 4092640026 4224660672 4372957836 4514020992 4576715728 4784090624 4948040448 5111768064 5148805194 5382101952 5456853368 5632880896 5830610448 6018694656 6138960039 6336991008 6597387264 6865073592 7176135936 7667652096 7774147264 8185280052 8449321344 8745915672 8867386723 9028041984 9153431456 9568181248 9896080896 10297610388 10764203904 10913706736 11265761792 11661220896 12037389312 12277920078 12673982016 13730147184 14352271872 15335304192 15548294528 16370560104 16898642688 17491831344 17734773446 18056083968 18306862912 19792161792 20595220776 21528407808 21827413472 22531523584 23322441792 24555840156 25347964032 26602160169 27460294368 28704543744 31096589056 32741120208 33797285376 34983662688 35469546892 36112167936 36613725824 41190441552 43056815616 43654826944 46644883584 49111680312 50695928064 53204320338 54920588736 62193178112 65482240416 67594570752 69967325376 70939093784 73227451648 79806480507 82380883104 86113631232 87309653888 93289767168 98223360624 101391856128 106408640676 109841177472 124386356224 130964480832 139934650752 141878187568 146454903296 159612961014 164761766208 174619307776 186579534336 196446721248 202783712256 212817281352 219682354944 261928961664 279869301504 283756375136 292909806592 319225922028 329523532416 349238615552 373159068672 392893442496 425634562704 439364709888 523857923328 559738603008 567512750272 638451844056 659047064832 698477231104 785786884992 851269125408 878729419776 1047715846656 1119477206016 1135025500544 1276903688112 1318094129664 1571573769984 1702538250816 2095431693312 2270051001088 2553807376224 2636188259328 3143147539968 3405076501632 4540102002176 5107614752448 6286295079936 6810153003264 9080204004352 10215229504896 13620306006528 20430459009792 27240612013056 40860918019584 81721836039168
• Sum of all divisors σ(n): 266026088065920
• Sum of proper divisors (its aliquot sum) s(n): 184304252026752
• 81721836039168 is an abundant number, because the sum of its proper divisors (184304252026752) is greater than itself. Its abundance is 102582415987584

Bases of 81721836039168

• Binary: 10010100101001101011001000000011110110000000000₂
• Hexadecimal: 0x4A535901EC00
• Base-36: SYUHR6KG0

Squares and roots of 81721836039168

• 81721836039168 squared (81721836039168²) is 6678458485612657746430132224
• 81721836039168 cubed (81721836039168³) is 545775889355627837842369429680218682949632
• The square root of 81721836039168 is 9040013.0552542899
• The cube root of 81721836039168 is 43395.6340754511

Scales and comparisons

• 81,721,836,039,168 seconds is equal to 2,598,501 years, 31 weeks, 2 days, 18 hours, 52 minutes, 48 seconds.
• To count from 1 to 81,721,836,039,168 would take you about six million, four hundred ninety-six thousand, two hundred fifty-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 81721836039168 cubic inches would be around 3616.3 feet tall.

Recreational maths with 81721836039168

• 81721836039168 backwards is 86193063812718
• The number of decimal digits it has is: 14
• The sum of 81721836039168's digits is 63
• More coming soon!