56561685856 has 24 divisors (see below), whose sum is σ = 119921652144. Its totient is φ = 26105393280.

The previous prime is 56561685809. The next prime is 56561685857. The reversal of 56561685856 is 65858616565.

56561685856 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 56561685794 and 56561685803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56561685857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67982380 + ... + 67983211.

It is an arithmetic number, because the mean of its divisors is an integer number (4996735506).

Almost surely, 2^56561685856 is an apocalyptic number.

It is an amenable number.

56561685856 is an abundant number, since it is smaller than the sum of its proper divisors (63359966288).

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

56561685856 is a wasteful number, since it uses less digits than its factorization.

56561685856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135965614 (or 135965606 counting only the distinct ones).

The product of its digits is 51840000, while the sum is 61.

The spelling of 56561685856 in words is "fifty-six billion, five hundred sixty-one million, six hundred eighty-five thousand, eight hundred fifty-six".