56561555886 has 64 divisors (see below), whose sum is σ = 135550126080. Its totient is φ = 15531769440.

The previous prime is 56561555879. The next prime is 56561555983. The reversal of 56561555886 is 68855516565.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 951700 + ... + 1009383.

It is an arithmetic number, because the mean of its divisors is an integer number (2117970720).

Almost surely, 2^56561555886 is an apocalyptic number.

56561555886 is an abundant number, since it is smaller than the sum of its proper divisors (78988570194).

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

56561555886 is a wasteful number, since it uses less digits than its factorization.

56561555886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1961141.

The product of its digits is 43200000, while the sum is 60.

The spelling of 56561555886 in words is "fifty-six billion, five hundred sixty-one million, five hundred fifty-five thousand, eight hundred eighty-six".