81618729746085

Names of 81618729746085

• Cardinal: 81618729746085 can be written as Eighty-one trillion, six hundred eighteen billion, seven hundred twenty-nine million, seven hundred forty-six thousand and eighty-five.

Scientific notation

• Scientific notation: 8.1618729746085 × 10¹³

Factors of 81618729746085

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 11
• Sum of prime factors: 257

Divisors of 81618729746085

• Number of divisors d(n): 648
• Complete list of divisors:
  1 3 5 7 9 15 19 21 35 43 45 49 53 57 63 95 105 127 129 133 147 159 171 215 245 265 285 301 315 371 381 387 399 441 477 635 645 665 735 795 817 855 889 903 931 1007 1113 1143 1197 1505 1855 1905 1935 1995 2107 2205 2279 2385 2413 2451 2597 2667 2709 2793 2809 3021 3339 4085 4445 4515 4655 5035 5461 5565 5715 5719 5985 6223 6321 6731 6837 7049 7239 7353 7791 8001 8379 8427 9063 10535 11395 12065 12255 12985 13335 13545 13965 14045 15105 15953 16129 16383 16695 16891 17157 18669 18963 19663 20193 20511 21147 21717 23373 25281 27305 28595 31115 31605 33655 34185 35245 36195 36765 38227 38955 40005 40033 41895 42135 43301 45315 47117 47859 48387 49149 49343 50673 51471 53371 56007 58989 60579 63441 79765 80645 81915 84455 85785 93345 94815 98315 100965 102555 103759 105735 108585 111671 112903 114681 116865 118237 120099 120787 126405 127889 129903 137641 141351 143577 145161 148029 152019 160113 176967 191135 200165 216505 235585 239295 241935 245745 246715 253365 257355 266855 267589 280035 289433 294945 302895 303107 306451 311277 317205 329819 335013 338709 344043 354711 356743 360297 362361 373597 383667 389709 412923 424053 444087 480339 518795 558355 564515 573405 591185 600495 603935 639445 649515 688205 693547 706755 717885 725805 726313 740145 760095 790321 800565 802767 845509 854837 868299 884835 895223 909321 919353 933831 989457 1005039 1016127 1064133 1070229 1087083 1120791 1151001 1238769 1337945 1447165 1515535 1532255 1556385 1649095 1675065 1693545 1720215 1773555 1783715 1801485 1811805 1867985 1918335 1948545 2026031 2064615 2080641 2120265 2121749 2145157 2178939 2220435 2294953 2370963 2401695 2408301 2497201 2536527 2564511 2604897 2615179 2685669 2727963 2758059 2968371 3210687 3362373 3467735 3631565 3951605 4013835 4227545 4274185 4341495 4476115 4546605 4596765 4669155 4854829 4947285 5025195 5080635 5084191 5320665 5351145 5435415 5499227 5603955 5755005 5918563 5983859 6078093 6193845 6241923 6266561 6365247 6435471 6536817 6778117 6884859 7112889 7491603 7609581 7693533 7845537 8057007 10130155 10403205 10608745 10725785 10894695 11474765 11854815 12041505 12486005 12682635 12822555 13024485 13075895 13177393 13428345 13639815 13790295 14182217 14564487 14841855 15016099 15252573 15339949 16053435 16064671 16241903 16497681 16811865 17480407 17755689 17951577 18234279 18799683 19095741 19306413 20334351 20654577 22474809 23536611 24274145 25420955 27496135 29592815 29919295 30390465 31209615 31332805 31826235 32177355 32684085 33890585 33983803 34424295 35564445 36757991 37458015 38047905 38467665 38494589 39227685 39532179 40285035 41887013 42546651 43693461 45048297 45306361 45757719 46019847 47446819 48194013 48725709 49493043 52441221 53267067 53854731 56399049 61003053 65886965 70911085 72822435 75080495 76262865 76699745 80323355 81209515 82488405 87402035 88778445 89757885 91171395 92241751 93998415 95478705 96532065 101671755 101951409 103272885 107379643 110273973 112374045 112452697 113693321 115483767 117683055 118596537 125661039 127639953 135144891 135919083 138059541 142340457 144582039 146177127 157323663 169919015 183789955 192472945 197660895 209435065 212733255 218467305 225241485 226531805 228788595 230099235 237234095 240970065 243628545 247465215 257305937 262206105 266335335 269273655 269462123 276725253 281995245 291459031 305015265 305854227 317144527 322138929 330821919 332127733 337358091 341079963 346451301 376983117 407757249 427021371 461208755 509757045 536898215 551369865 562263485 568466605 577418835 592982685 628305195 638199765 645692257 675724455 679595415 690297705 698401829 711702285 722910195 730885635 751657501 771917811 786618315 795853247 808386369 830175759 860820859 874377093 951433581 966416787 996383199 1012074273 1023239889 1286529685 1347310615 1383626265 1457295155 1529271135 1585722635 1610694645 1654109595 1660638665 1686790455 1705399815 1732256505 1801141559 1884915585 1937076771 1948173523 2038786245 2040213217 2095205487 2135106855 2220011689 2254972503 2315753433 2387559741 2425159107 2582462577 2623131279 2854300743 2989149597 3228461285 3492009145 3758287505 3859589055 3979266235 4041931845 4150878795 4304104295 4371885465 4757167905 4832083935 4888812803 4981915995 5060371365 5116199445 5403424677 5811230313 5844520569 6025746013 6120639651 6285616461 6660035067 6764917509 7162679223 7747387731 9005707795 9685383855 9740867615 10201066085 10476027435 11100058445 11274862515 11578767165 11937798705 12125795535 12912312885 13115656395 13637214661 14271503715 14281492519 14666438409 14945747985 16210274031 17533561707 18077238039 18361918953 19980105201 24444064015 27017123385 29056151565 29222602845 30128730065 30603198255 31428082305 33300175335 33824587545 34221689621 35813396115 37015296937 38736938655 40911643983 42180222091 42844477557 43999315227 54231714117 68186073305 71407462595 73332192045 81051370155 87667808535 90386190195 91809594765 95460502627 99900526005 102665068863 111045890811 122734931949 126540666273 128533432671 171108448105 185076484685 204558219915 210901110455 214222387785 219996576135 259107078559 271158570585 286381507881 307995206589 333137672433 379621998819 477302513135 513325344315 555229454055 613674659745 632703331365 642667163355 777321235677 859144523643 1295535392795 1431907539405 1539976032945 1665688362165 1813749549913 1898109994095 2331963707031 3886606178385 4295722618215 5441248649739 9068747749565 11659818535155 16323745949217 27206243248695 81618729746085
• Sum of all divisors σ(n): 182101651411680
• Sum of proper divisors (its aliquot sum) s(n): 100482921665595
• 81618729746085 is an abundant number, because the sum of its proper divisors (100482921665595) is greater than itself. Its abundance is 18864191919510

Bases of 81618729746085

• Binary: 10010100011101101010111011001001011111010100101₂
• Hexadecimal: 0x4A3B5764BEA5
• Base-36: SXJ4KCVJ9

Squares and roots of 81618729746085

• 81618729746085 squared (81618729746085²) is 6661617045364460408572827225
• 81618729746085 cubed (81618729746085³) is 543712721297515153609278305971154825164125
• The square root of 81618729746085 is 9034308.4818974939
• The cube root of 81618729746085 is 43377.3760176653

Scales and comparisons

• 81,618,729,746,085 seconds is equal to 2,595,223 years, 7 weeks, 2 days, 21 hours, 54 minutes, 45 seconds.
• To count from 1 to 81,618,729,746,085 would take you about six million, four hundred eighty-eight thousand and fifty-seven 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 81618729746085 cubic inches would be around 3614.8 feet tall.

Recreational maths with 81618729746085

• 81618729746085 backwards is 58064792781618
• The number of decimal digits it has is: 14
• The sum of 81618729746085's digits is 72
• More coming soon!