56510665566 has 16 divisors (see below), whose sum is σ = 119669644944. Its totient is φ = 17728836224.

The previous prime is 56510665543. The next prime is 56510665567. The reversal of 56510665566 is 66556601565.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56510665567) 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 7 ways as a sum of consecutive naturals, for example, 277012965 + ... + 277013168.

It is an arithmetic number, because the mean of its divisors is an integer number (7479352809).

Almost surely, 2^56510665566 is an apocalyptic number.

56510665566 is an abundant number, since it is smaller than the sum of its proper divisors (63158979378).

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

56510665566 is a wasteful number, since it uses less digits than its factorization.

56510665566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554026155.

The product of its (nonzero) digits is 4860000, while the sum is 51.

The spelling of 56510665566 in words is "fifty-six billion, five hundred ten million, six hundred sixty-five thousand, five hundred sixty-six".