56559969920 has 128 divisors (see below), whose sum is σ = 137240082000. Its totient is φ = 22286860288.

The previous prime is 56559969919. The next prime is 56559969931. The reversal of 56559969920 is 2996995565.

It can be written as a sum of positive squares in 8 ways, for example, as 46300710976 + 10259258944 = 215176^2 + 101288^2 .

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16687586 + ... + 16690974.

Almost surely, 2^56559969920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56559969920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68620041000).

56559969920 is an abundant number, since it is smaller than the sum of its proper divisors (80680112080).

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

56559969920 is a wasteful number, since it uses less digits than its factorization.

56559969920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3790 (or 3778 counting only the distinct ones).

The product of its (nonzero) digits is 59049000, while the sum is 65.

The spelling of 56559969920 in words is "fifty-six billion, five hundred fifty-nine million, nine hundred sixty-nine thousand, nine hundred twenty".