56520861678 has 24 divisors (see below), whose sum is σ = 122604463800. Its totient is φ = 18818349264.

The previous prime is 56520861653. The next prime is 56520861731. The reversal of 56520861678 is 87616802565.

56520861678 is a `hidden beast` number, since 56 + 520 + 8 + 6 + 1 + 67 + 8 = 666.

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 11 ways as a sum of consecutive naturals, for example, 1812273 + ... + 1843196.

It is an arithmetic number, because the mean of its divisors is an integer number (5108519325).

Almost surely, 2^56520861678 is an apocalyptic number.

56520861678 is an abundant number, since it is smaller than the sum of its proper divisors (66083602122).

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

56520861678 is a wasteful number, since it uses less digits than its factorization.

56520861678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3656336 (or 3656333 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 54.

The spelling of 56520861678 in words is "fifty-six billion, five hundred twenty million, eight hundred sixty-one thousand, six hundred seventy-eight".