56331309681 has 16 divisors (see below), whose sum is σ = 84006472320. Its totient is φ = 37305500400.

The previous prime is 56331309659. The next prime is 56331309709. The reversal of 56331309681 is 18690313365.

56331309681 is a `hidden beast` number, since 5 + 6 + 331 + 309 + 6 + 8 + 1 = 666.

It is not a de Polignac number, because 56331309681 - 2⁷ = 56331309553 is a prime.

It is a super-2 number, since 2×56331309681² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (56331309631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6904350 + ... + 6912503.

It is an arithmetic number, because the mean of its divisors is an integer number (5250404520).

Almost surely, 2^56331309681 is an apocalyptic number.

It is an amenable number.

56331309681 is a deficient number, since it is larger than the sum of its proper divisors (27675162639).

56331309681 is a wasteful number, since it uses less digits than its factorization.

56331309681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13817013 (or 13817007 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The spelling of 56331309681 in words is "fifty-six billion, three hundred thirty-one million, three hundred nine thousand, six hundred eighty-one".