56851688817 has 24 divisors (see below), whose sum is σ = 102382263360. Its totient is φ = 29533344480.

The previous prime is 56851688809. The next prime is 56851688819. The reversal of 56851688817 is 71888615865.

56851688817 is a `hidden beast` number, since 568 + 5 + 1 + 68 + 8 + 8 + 1 + 7 = 666.

It is not a de Polignac number, because 56851688817 - 2³ = 56851688809 is a prime.

It is a super-2 number, since 2×56851688817² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (56851688819) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 41017842 + ... + 41019227.

It is an arithmetic number, because the mean of its divisors is an integer number (4265927640).

Almost surely, 2^56851688817 is an apocalyptic number.

It is an amenable number.

56851688817 is a deficient number, since it is larger than the sum of its proper divisors (45530574543).

56851688817 is a wasteful number, since it uses less digits than its factorization.

56851688817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82037093 (or 82037090 counting only the distinct ones).

The product of its digits is 25804800, while the sum is 63.

The spelling of 56851688817 in words is "fifty-six billion, eight hundred fifty-one million, six hundred eighty-eight thousand, eight hundred seventeen".