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12805881451 = 112298834133
BaseRepresentation
bin10111110110100101…
…00011111001101011
31020001110112011212121
423323102203321223
5202211301201301
65514414252111
7632225124226
oct137322437153
936043464777
1012805881451
11548164a300
1225947b7037
1312910c675c
14896a785bd
154ee3aa3a1
hex2fb4a3e6b

12805881451 has 24 divisors (see below), whose sum is σ = 14581279440. Its totient is φ = 11224825920.

The previous prime is 12805881349. The next prime is 12805881469. The reversal of 12805881451 is 15418850821.

It is not a de Polignac number, because 12805881451 - 211 = 12805879403 is a prime.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12805881398 and 12805881407.

It is not an unprimeable number, because it can be changed into a prime (12805881251) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3096381 + ... + 3100513.

It is an arithmetic number, because the mean of its divisors is an integer number (607553310).

Almost surely, 212805881451 is an apocalyptic number.

12805881451 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12805881451 is a deficient number, since it is larger than the sum of its proper divisors (1775397989).

12805881451 is a wasteful number, since it uses less digits than its factorization.

12805881451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5067 (or 5056 counting only the distinct ones).

The product of its (nonzero) digits is 102400, while the sum is 43.

The spelling of 12805881451 in words is "twelve billion, eight hundred five million, eight hundred eighty-one thousand, four hundred fifty-one".

Divisors: 1 11 29 121 319 883 3509 4133 9713 25607 45463 106843 119857 281677 500093 1318427 3098447 3649439 14502697 40143829 105833731 441582119 1164171041 12805881451