56821515688 has 32 divisors (see below), whose sum is σ = 121793981760. Its totient is φ = 24345360000.

The previous prime is 56821515659. The next prime is 56821515701. The reversal of 56821515688 is 88651512865.

56821515688 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×56821515688² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67563 + ... + 343813.

It is an arithmetic number, because the mean of its divisors is an integer number (3806061930).

Almost surely, 2^56821515688 is an apocalyptic number.

It is an amenable number.

56821515688 is an abundant number, since it is smaller than the sum of its proper divisors (64972466072).

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

56821515688 is a wasteful number, since it uses less digits than its factorization.

56821515688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279937 (or 279933 counting only the distinct ones).

The product of its digits is 4608000, while the sum is 55.

The spelling of 56821515688 in words is "fifty-six billion, eight hundred twenty-one million, five hundred fifteen thousand, six hundred eighty-eight".