18643940991

Names of 18643940991

• Cardinal: 18643940991 can be written as Eighteen billion, six hundred forty-three million, nine hundred forty thousand, nine hundred ninety-one.

Scientific notation

• Scientific notation: 1.8643940991 × 10¹⁰

Factors of 18643940991

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 11
• Sum of prime factors: 1164

Divisors of 18643940991

• Number of divisors d(n): 72
• Complete list of divisors:
  1 3 9 13 27 39 81 117 241 243 351 723 729 907 1053 2169 2187 2721 3133 3159 6507 6561 8163 9399 9477 11791 19521 24489 28197 28431 35373 58563 73467 84591 85293 106119 175689 218587 220401 253773 318357 527067 655761 661203 761319 955071 1581201 1967283 1983609 2283957 2841631 2865213 5901849 5950827 6851871 8524893 8595639 17705547 20555613 25574679 25786917 53116641 76724037 77360751 159349923 230172111 478049769 690516333 1434149307 2071548999 6214646997 18643940991
• Sum of all divisors σ(n): 30273907664
• Sum of proper divisors (its aliquot sum) s(n): 11629966673
• 18643940991 is a deficient number, because the sum of its proper divisors (11629966673) is less than itself. Its deficiency is 7013974318

Bases of 18643940991

• Binary: 10001010111010000111111011001111111₂
• Hexadecimal: 0x45743F67F
• Base-36: 8KC4CXR

Squares and roots of 18643940991

• 18643940991 squared (18643940991²) is 347596535675890062081
• 18643940991 cubed (18643940991³) is 6480569299817320618841490662271
• The square root of 18643940991 is 136542.8174273549
• The cube root of 18643940991 is 2651.6278590143

Scales and comparisons

• 18,643,940,991 seconds is equal to 592 years, 42 weeks, 4 days, 8 hours, 29 minutes, 51 seconds.
• To count from 1 to 18,643,940,991 would take you about one thousand, one hundred eighty-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 18643940991 cubic inches would be around 221 feet tall.

Recreational maths with 18643940991

• 18643940991 backwards is 19904934681
• The number of decimal digits it has is: 11
• The sum of 18643940991's digits is 54
• More coming soon!