81665320000

Names of 81665320000

• Cardinal: 81665320000 can be written as Eighty-one billion, six hundred sixty-five million, three hundred twenty thousand.

Scientific notation

• Scientific notation: 8.166532 × 10¹⁰

Factors of 81665320000

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 14
• Sum of prime factors: 424

Divisors of 81665320000

• Number of divisors d(n): 420
• Complete list of divisors:
  1 2 4 5 8 10 11 16 20 22 25 32 40 44 47 50 55 64 80 88 94 100 110 121 125 160 176 188 200 220 235 242 250 275 320 352 359 376 400 440 470 484 500 517 550 605 625 704 718 752 800 880 940 968 1000 1034 1100 1175 1210 1250 1375 1436 1504 1600 1760 1795 1880 1936 2000 2068 2200 2350 2420 2500 2585 2750 2872 3008 3025 3520 3590 3760 3872 3949 4000 4136 4400 4700 4840 5000 5170 5500 5687 5744 5875 6050 6875 7180 7520 7744 7898 8000 8272 8800 8975 9400 9680 10000 10340 11000 11374 11488 11750 12100 12925 13750 14360 15040 15125 15796 16544 16873 17600 17950 18800 19360 19745 20000 20680 22000 22748 22976 23500 24200 25850 27500 28435 28720 29375 30250 31592 33088 33746 35900 37600 38720 39490 40000 41360 43439 44000 44875 45496 47000 48400 51700 55000 56870 57440 58750 60500 63184 64625 67492 71800 75200 75625 78980 82720 84365 86878 88000 89750 90992 94000 96800 98725 103400 110000 113740 114880 117500 121000 126368 129250 134984 142175 143600 151250 157960 165440 168730 173756 179500 181984 185603 188000 193600 197450 206800 217195 220000 224375 227480 235000 242000 252736 258500 269968 284350 287200 302500 315920 323125 337460 347512 359000 363968 371206 376000 394900 413600 421825 434390 440000 448750 454960 470000 484000 493625 517000 539936 568700 574400 605000 631840 646250 674920 695024 710875 718000 742412 789800 827200 843650 868780 897500 909920 928015 940000 968000 987250 1034000 1079872 1085975 1137400 1210000 1263680 1292500 1349840 1390048 1421750 1436000 1484824 1579600 1687300 1737560 1795000 1819840 1856030 1880000 1974500 2041633 2068000 2109125 2171950 2274800 2420000 2468125 2585000 2699680 2780096 2843500 2872000 2969648 3159200 3374600 3475120 3554375 3590000 3712060 3949000 4083266 4136000 4218250 4343900 4549600 4640075 4840000 4936250 5170000 5399360 5429875 5687000 5939296 6318400 6749200 6950240 7108750 7180000 7424120 7898000 8166532 8436500 8687800 9099200 9280150 9872500 10208165 10340000 10545625 10859750 11374000 11878592 13498400 13900480 14217500 14360000 14848240 15796000 16333064 16873000 17375600 18560300 19745000 20416330 20680000 21091250 21719500 22748000 23200375 26996800 27149375 28435000 29696480 31592000 32666128 33746000 34751200 37120600 39490000 40832660 42182500 43439000 45496000 46400750 51040825 54298750 56870000 59392960 65332256 67492000 69502400 74241200 78980000 81665320 84365000 86878000 92801500 102081650 108597500 113740000 116001875 130664512 134984000 148482400 157960000 163330640 168730000 173756000 185603000 204163300 217195000 227480000 232003750 255204125 296964800 326661280 337460000 347512000 371206000 408326600 434390000 464007500 510408250 653322560 674920000 742412000 816653200 868780000 928015000 1020816500 1276020625 1484824000 1633306400 1737560000 1856030000 2041633000 2552041250 3266612800 3712060000 4083266000 5104082500 7424120000 8166532000 10208165000 16333064000 20416330000 40832660000 81665320000
• Sum of all divisors σ(n): 227955530880
• Sum of proper divisors (its aliquot sum) s(n): 146290210880
• 81665320000 is an abundant number, because the sum of its proper divisors (146290210880) is greater than itself. Its abundance is 64624890880

Bases of 81665320000

• Binary: 1001100000011101000011110010001000000₂
• Hexadecimal: 0x1303A1E440
• Base-36: 11ILF874

Squares and roots of 81665320000

• 81665320000 squared (81665320000²) is 6669224490702400000000
• 81665320000 cubed (81665320000³) is 544644352185048520768000000000000
• The square root of 81665320000 is 285771.4471391429
• The cube root of 81665320000 is 4338.5628120871

Scales and comparisons

• 81,665,320,000 seconds is equal to 2,596 years, 36 weeks, 4 days, 11 hours, 6 minutes, 40 seconds.
• To count from 1 to 81,665,320,000 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 81665320000 cubic inches would be around 361.5 feet tall.

Recreational maths with 81665320000

• 81665320000 backwards is 00002356618
• The number of decimal digits it has is: 11
• The sum of 81665320000's digits is 31
• More coming soon!