81663966720

Names of 81663966720

• Cardinal: 81663966720 can be written as Eighty-one billion, six hundred sixty-three million, nine hundred sixty-six thousand, seven hundred twenty.

Scientific notation

• Scientific notation: 8.166396672 × 10¹⁰

Factors of 81663966720

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 17
• Sum of prime factors: 587

Divisors of 81663966720

• Number of divisors d(n): 800
• Complete list of divisors:
  1 2 3 4 5 6 7 8 9 10 12 14 15 16 18 20 21 24 27 28 30 32 35 36 40 42 45 48 54 56 60 63 64 70 72 80 81 84 90 96 105 108 112 120 126 127 128 135 140 144 160 162 168 180 189 192 210 216 224 240 252 254 256 270 280 288 315 320 324 336 360 378 381 384 405 420 432 443 448 480 504 508 512 540 560 567 576 630 635 640 648 672 720 756 762 768 810 840 864 886 889 896 945 960 1008 1016 1080 1120 1134 1143 1152 1260 1270 1280 1296 1329 1344 1440 1512 1524 1536 1620 1680 1728 1772 1778 1792 1890 1905 1920 2016 2032 2160 2215 2240 2268 2286 2304 2520 2540 2560 2592 2658 2667 2688 2835 2880 3024 3048 3101 3240 3360 3429 3456 3544 3556 3584 3780 3810 3840 3987 4032 4064 4320 4430 4445 4480 4536 4572 4608 5040 5080 5184 5316 5334 5376 5670 5715 5760 6048 6096 6202 6480 6645 6720 6858 6912 7088 7112 7560 7620 7680 7974 8001 8064 8128 8640 8860 8890 8960 9072 9144 9303 10080 10160 10287 10368 10632 10668 10752 11340 11430 11520 11961 12096 12192 12404 12960 13290 13335 13440 13716 13824 14176 14224 15120 15240 15505 15948 16002 16128 16256 17145 17280 17720 17780 17920 18144 18288 18606 19935 20160 20320 20574 20736 21264 21336 22680 22860 23040 23922 24003 24192 24384 24808 25920 26580 26670 26880 27432 27909 28352 28448 30240 30480 31010 31896 32004 32256 32512 34290 34560 35440 35560 35883 36288 36576 37212 39870 40005 40320 40640 41148 41472 42528 42672 45360 45720 46515 47844 48006 48384 48768 49616 51435 51840 53160 53340 53760 54864 55818 56261 56704 56896 59805 60480 60960 62020 63792 64008 65024 68580 69120 70880 71120 71766 72009 72576 73152 74424 79740 80010 80640 81280 82296 83727 85056 85344 90720 91440 93030 95688 96012 96768 97536 99232 102870 103680 106320 106680 109728 111636 112522 113408 113792 119610 120015 120960 121920 124040 127584 128016 137160 139545 141760 142240 143532 144018 145152 146304 148848 159480 160020 161280 162560 164592 167454 168783 170112 170688 179415 181440 182880 186060 191376 192024 195072 198464 205740 207360 212640 213360 219456 223272 225044 226816 227584 239220 240030 241920 243840 248080 251181 255168 256032 274320 279090 281305 283520 284480 287064 288036 290304 292608 297696 318960 320040 325120 329184 334908 337566 340224 341376 358830 360045 362880 365760 372120 382752 384048 393827 396928 411480 418635 425280 426720 438912 446544 450088 455168 478440 480060 483840 487680 496160 502362 506349 510336 512064 548640 558180 562610 567040 568960 574128 576072 585216 595392 637920 640080 658368 669816 675132 680448 682752 717660 720090 725760 731520 744240 765504 768096 787654 793856 822960 837270 843915 850560 853440 877824 893088 900176 956880 960120 975360 992320 1004724 1012698 1020672 1024128 1097280 1116360 1125220 1134080 1137920 1148256 1152144 1181481 1190784 1255905 1275840 1280160 1316736 1339632 1350264 1365504 1435320 1440180 1451520 1463040 1488480 1519047 1531008 1536192 1575308 1587712 1645920 1674540 1687830 1701120 1706880 1755648 1786176 1800352 1913760 1920240 1969135 1984640 2009448 2025396 2041344 2048256 2194560 2232720 2250440 2275840 2296512 2304288 2362962 2381568 2511810 2531745 2551680 2560320 2633472 2679264 2700528 2870640 2880360 2926080 2976960 3038094 3062016 3072384 3150616 3291840 3349080 3375660 3402240 3413760 3544443 3572352 3600704 3827520 3840480 3938270 3969280 4018896 4050792 4096512 4389120 4465440 4500880 4557141 4593024 4608576 4725924 4763136 5023620 5063490 5103360 5120640 5266944 5358528 5401056 5741280 5760720 5907405 5953920 6076188 6124032 6144768 6301232 6583680 6698160 6751320 6827520 7088886 7144704 7201408 7595235 7655040 7680960 7876540 7938560 8037792 8101584 8778240 8930880 9001760 9114282 9186048 9217152 9451848 10047240 10126980 10206720 10241280 10633329 10717056 10802112 11482560 11521440 11814810 11907840 12152376 12289536 12602464 13167360 13396320 13502640 14177772 14289408 14402816 15190470 15310080 15361920 15753080 16075584 16203168 17722215 17861760 18003520 18228564 18372096 18434304 18903696 20094480 20253960 20482560 21266658 21434112 21604224 22785705 22965120 23042880 23629620 23815680 24304752 25204928 26334720 26792640 27005280 28355544 28805632 30380940 30620160 30723840 31506160 31899987 32151168 32406336 35444430 35723520 36007040 36457128 36868608 37807392 40188960 40507920 42533316 42868224 43208448 45571410 45930240 46085760 47259240 48609504 50409856 53166645 53585280 54010560 56711088 60761880 61447680 63012320 63799974 64302336 64812672 70888860 71447040 72014080 72914256 75614784 80377920 81015840 85066632 86416896 91142820 91860480 92171520 94518480 97219008 100819712 106333290 107170560 108021120 113422176 121523760 126024640 127599948 128604672 129625344 141777720 144028160 145828512 151229568 159499935 160755840 162031680 170133264 182285640 184343040 189036960 194438016 201639424 212666580 214341120 216042240 226844352 243047520 252049280 255199896 259250688 283555440 291657024 302459136 318999870 321511680 324063360 340266528 364571280 378073920 388876032 425333160 432084480 453688704 486095040 504098560 510399792 567110880 583314048 604918272 637999740 643023360 648126720 680533056 729142560 756147840 777752064 850666320 907377408 972190080 1008197120 1020799584 1134221760 1166628096 1275999480 1296253440 1361066112 1458285120 1512295680 1701332640 1814754816 1944380160 2041599168 2268443520 2333256192 2551998960 2722132224 2916570240 3024591360 3402665280 3888760320 4083198336 4536887040 5103997920 5444264448 5833140480 6805330560 8166396672 9073774080 10207995840 11666280960 13610661120 16332793344 20415991680 27221322240 40831983360 81663966720
• Sum of all divisors σ(n): 337672101888
• Sum of proper divisors (its aliquot sum) s(n): 256008135168
• 81663966720 is an abundant number, because the sum of its proper divisors (256008135168) is greater than itself. Its abundance is 174344168448

Bases of 81663966720

• Binary: 1001100000011100011010011111000000000₂
• Hexadecimal: 0x13038D3E00
• Base-36: 11IKM800

Squares and roots of 81663966720

• 81663966720 squared (81663966720²) is 6669003460445267558400
• 81663966720 cubed (81663966720³) is 544617276649367166270673256448000
• The square root of 81663966720 is 285769.0793630411
• The cube root of 81663966720 is 4338.5388471093

Scales and comparisons

• 81,663,966,720 seconds is equal to 2,596 years, 34 weeks, 2 days, 19 hours, 12 minutes.
• To count from 1 to 81,663,966,720 would take you about five thousand, one hundred ninety-three 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 81663966720 cubic inches would be around 361.5 feet tall.

Recreational maths with 81663966720

• 81663966720 backwards is 02766936618
• 81663966720 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81663966720's digits is 54
• More coming soon!