56621404775 has 12 divisors (see below), whose sum is σ = 75611353272. Its totient is φ = 41812729440.

The previous prime is 56621404747. The next prime is 56621404787. The reversal of 56621404775 is 57740412665.

It is not a de Polignac number, because 56621404775 - 2¹⁸ = 56621142631 is a prime.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 87109529 + ... + 87110178.

It is an arithmetic number, because the mean of its divisors is an integer number (6300946106).

Almost surely, 2^56621404775 is an apocalyptic number.

56621404775 is a deficient number, since it is larger than the sum of its proper divisors (18989948497).

56621404775 is a wasteful number, since it uses less digits than its factorization.

56621404775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174219730 (or 174219725 counting only the distinct ones).

The product of its (nonzero) digits is 1411200, while the sum is 47.

The spelling of 56621404775 in words is "fifty-six billion, six hundred twenty-one million, four hundred four thousand, seven hundred seventy-five".