56561661056 has 32 divisors (see below), whose sum is σ = 114807512700. Its totient is φ = 27747226624.

The previous prime is 56561661053. The next prime is 56561661083. The reversal of 56561661056 is 65016616565.

It can be written as a sum of positive squares in 2 ways, for example, as 56541230656 + 20430400 = 237784^2 + 4520^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 56561661056.

It is not an unprimeable number, because it can be changed into a prime (56561661053) 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, 4161971 + ... + 4175538.

Almost surely, 2^56561661056 is an apocalyptic number.

It is an amenable number.

56561661056 is an abundant number, since it is smaller than the sum of its proper divisors (58245851644).

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

56561661056 is an equidigital number, since it uses as much as digits as its factorization.

56561661056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8337576 (or 8337564 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 47.

The spelling of 56561661056 in words is "fifty-six billion, five hundred sixty-one million, six hundred sixty-one thousand, fifty-six".