138721781291161674321

Names of 138721781291161674321

• Cardinal: 138721781291161674321 can be written as One hundred thirty-eight quintillion, seven hundred twenty-one quadrillion, seven hundred eighty-one trillion, two hundred ninety-one billion, one hundred sixty-one million, six hundred seventy-four thousand, three hundred twenty-one.

Scientific notation

• Scientific notation: 1.38721781291161674321 × 10²⁰

Factors of 138721781291161674321

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 6
• Sum of prime factors: 135379585

Divisors of 138721781291161674321

• Number of divisors d(n): 27
• Complete list of divisors:
  1 3 9 29 87 261 841 2523 7569 135379553 406138659 1218415977 3926007037 11778021111 35334063333 113854204073 341562612219 1024687836657 18327623370479809 54982870111439427 164948610334318281 531501077743914461 1594503233231743383 4783509699695230149 15413531254573519369 46240593763720558107 138721781291161674321
• Sum of all divisors σ(n): 207523680956845567249
• Sum of proper divisors (its aliquot sum) s(n): 68801899665683892928
• 138721781291161674321 is a deficient number, because the sum of its proper divisors (68801899665683892928) is less than itself. Its deficiency is 69919881625477781393

Bases of 138721781291161674321

• Binary: 1111000010100100110110001010001101011010101000111101110001001010001₂
• Hexadecimal: 0x78526C51AD51EE251
• Base-36: T9XY7EFBCJGI9

Squares and roots of 138721781291161674321

• 138721781291161674321 squared (138721781291161674321²) is 19243732604592893126277291995408070811041
• 138721781291161674321 cubed (138721781291161674321³) is 2669524865599932319758728862684359823786546925000225972978161
• 138721781291161674321 is a perfect square number. Its square root is 11778021111
• The cube root of 138721781291161674321 is 5176643.0410752169

Scales and comparisons

• 138,721,781,291,161,674,321 seconds is equal to 293,274,701,009 years, 3 weeks, 3 days, 15 hours, 30 minutes, 7 seconds.
• To count from 1 to 138,721,781,291,161,674,321 would take you about two hundred ninety-three billion, two hundred seventy-four million, seven hundred one thousand and nine 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 138721781291161674321 cubic inches would be around 431386.9 feet tall.

Recreational maths with 138721781291161674321

• 138721781291161674321 backwards is 123476161192187127831
• The number of decimal digits it has is: 21
• The sum of 138721781291161674321's digits is 81
• More coming soon!