56561688856 has 64 divisors (see below), whose sum is σ = 116232732000. Its totient is φ = 25684162560.

The previous prime is 56561688763. The next prime is 56561688857. The reversal of 56561688856 is 65888616565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56561688857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9103591 + ... + 9109801.

Almost surely, 2^56561688856 is an apocalyptic number.

It is an amenable number.

56561688856 is an abundant number, since it is smaller than the sum of its proper divisors (59671043144).

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

56561688856 is a wasteful number, since it uses less digits than its factorization.

56561688856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8572 (or 8568 counting only the distinct ones).

The product of its digits is 82944000, while the sum is 64.

The spelling of 56561688856 in words is "fifty-six billion, five hundred sixty-one million, six hundred eighty-eight thousand, eight hundred fifty-six".