13091791612656 has 80 divisors (see below), whose sum is σ = 35880805068800. Its totient is φ = 4101696797184.

The previous prime is 13091791612597. The next prime is 13091791612681. The reversal of 13091791612656 is 65621619719031.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a junction number, because it is equal to n+sod(n) for n = 13091791612596 and 13091791612605.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56400061 + ... + 56631708.

It is an arithmetic number, because the mean of its divisors is an integer number (448510063360).

Almost surely, 2^{13091791612656} is an apocalyptic number.

13091791612656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

13091791612656 is an abundant number, since it is smaller than the sum of its proper divisors (22789013456144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13091791612656 is a wasteful number, since it uses less digits than its factorization.

13091791612656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113031926 (or 113031920 counting only the distinct ones).

The product of its (nonzero) digits is 3674160, while the sum is 57.

The spelling of 13091791612656 in words is "thirteen trillion, ninety-one billion, seven hundred ninety-one million, six hundred twelve thousand, six hundred fifty-six".