56556564813 has 24 divisors (see below), whose sum is σ = 93397938816. Its totient is φ = 32306018400.

The previous prime is 56556564797. The next prime is 56556564847. The reversal of 56556564813 is 31846565565.

56556564813 is a `hidden beast` number, since 5 + 6 + 5 + 565 + 64 + 8 + 13 = 666.

It is not a de Polignac number, because 56556564813 - 2⁴ = 56556564797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56556564813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56556564853) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5223 + ... + 336363.

It is an arithmetic number, because the mean of its divisors is an integer number (3891580784).

Almost surely, 2^56556564813 is an apocalyptic number.

It is an amenable number.

56556564813 is a deficient number, since it is larger than the sum of its proper divisors (36841374003).

56556564813 is a wasteful number, since it uses less digits than its factorization.

56556564813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333865 (or 333862 counting only the distinct ones).

The product of its digits is 12960000, while the sum is 54.

The spelling of 56556564813 in words is "fifty-six billion, five hundred fifty-six million, five hundred sixty-four thousand, eight hundred thirteen".