81643626693715440

Names of 81643626693715440

• Cardinal: 81643626693715440 can be written as Eighty-one quadrillion, six hundred forty-three trillion, six hundred twenty-six billion, six hundred ninety-three million, seven hundred fifteen thousand, four hundred forty.

Scientific notation

• Scientific notation: 8.164362669371544 × 10¹⁶

Factors of 81643626693715440

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 10
• Sum of prime factors: 2311127634

Divisors of 81643626693715440

• Number of divisors d(n): 320
• Complete list of divisors:
  1 2 3 4 5 6 8 10 12 15 16 19 20 24 30 38 40 48 57 60 61 76 80 95 114 120 122 127 152 183 190 228 240 244 254 285 304 305 366 380 381 456 488 508 570 610 635 732 760 762 912 915 976 1016 1140 1159 1220 1270 1464 1520 1524 1830 1905 2032 2280 2318 2413 2440 2540 2928 3048 3477 3660 3810 4560 4636 4826 4880 5080 5795 6096 6954 7239 7320 7620 7747 9272 9652 10160 11590 12065 13908 14478 14640 15240 15494 17385 18544 19304 23180 23241 24130 27816 28956 30480 30988 34770 36195 38608 38735 46360 46482 48260 55632 57912 61976 69540 72390 77470 92720 92964 96520 115824 116205 123952 139080 144780 147193 154940 185928 193040 232410 278160 289560 294386 309880 371856 441579 464820 579120 588772 619760 735965 883158 929640 1177544 1471930 1766316 1859280 2207895 2355088 2943860 3532632 4415790 5887720 7065264 8831580 11775440 17663160 35326320 2311127417 4622254834 6933382251 9244509668 11555637085 13866764502 18489019336 23111274170 27733529004 34666911255 36978038672 43911420923 46222548340 55467058008 69333822510 87822841846 92445096680 110934116016 131734262769 138667645020 140978772437 175645683692 184890193360 219557104615 263468525538 277335290040 281957544874 293513181959 351291367384 422936317311 439114209230 526937051076 554670580080 563915089748 587026363918 658671313845 702582734768 704893862185 845872634622 878228418460 880539545877 1053874102152 1127830179496 1174052727836 1317342627690 1409787724370 1467565909795 1691745269244 1756456836920 1761079091754 2107748204304 2114681586555 2255660358992 2348105455672 2634685255380 2678596676303 2819575448740 2935131819590 3383490538488 3512913673840 3522158183508 4229363173110 4402697729385 4696210911344 5269370510760 5357193352606 5576750457221 5639150897480 5870263639180 6766981076976 7044316367016 8035790028909 8458726346220 8805395458770 10538741021520 10714386705212 11153500914442 11278301794960 11740527278360 13392983381515 14088632734032 16071580057818 16730251371663 16917452692440 17610790917540 17904304099499 21428773410424 22307001828884 23481054556720 26785966763030 27883752286105 32143160115636 33460502743326 33834905384880 35221581835080 35808608198998 40178950144545 42857546820848 44614003657768 53571933526060 53712912298497 55767504572210 64286320231272 66921005486652 70443163670160 71617216397996 80357900289090 83651256858315 89228007315536 89521520497495 107143867052120 107425824596994 111535009144420 128572640462544 133842010973304 143234432795992 160715800578180 167302513716630 179043040994990 214287734104240 214851649193988 223070018288840 267684021946608 268564561492485 286468865591984 321431601156360 334605027433260 340181777890481 358086081989980 429703298387976 446140036577680 537129122984970 642863202312720 669210054866520 680363555780962 716172163979960 859406596775952 1020545333671443 1074258245969940 1338420109733040 1360727111561924 1432344327959920 1700908889452405 2041090667342886 2148516491939880 2721454223123848 3401817778904810 4082181334685772 4297032983879760 5102726668357215 5442908446247696 6803635557809620 8164362669371544 10205453336714430 13607271115619240 16328725338743088 20410906673428860 27214542231238480 40821813346857720 81643626693715440
• Sum of all divisors σ(n): 272915674976010240
• Sum of proper divisors (its aliquot sum) s(n): 191272048282294800
• 81643626693715440 is an abundant number, because the sum of its proper divisors (191272048282294800) is greater than itself. Its abundance is 109628421588579360

Bases of 81643626693715440

• Binary: 100100010000011100111001000100111010000001110010111110000₂
• Hexadecimal: 0x1220E722740E5F0
• Base-36: MBW90BHGQ9C

Squares and roots of 81643626693715440

• 81643626693715440 squared (81643626693715440²) is 6665681779702764348811991694393600
• 81643626693715440 cubed (81643626693715440³) is 544210434881153252367026033664601670746201757184000
• The square root of 81643626693715440 is 285733488.9258090447
• The cube root of 81643626693715440 is 433817.8617560491

Scales and comparisons

• 81,643,626,693,715,440 seconds is equal to 2,596,014,788 years, 28 weeks, 1 day, 2 hours, 44 minutes.
• To count from 1 to 81,643,626,693,715,440 would take you about seven billion, seven hundred eighty-eight million, forty-four thousand, three hundred sixty-five 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 81643626693715440 cubic inches would be around 36151.5 feet tall.

Recreational maths with 81643626693715440

• 81643626693715440 backwards is 04451739662634618
• The number of decimal digits it has is: 17
• The sum of 81643626693715440's digits is 75
• More coming soon!