56577705821 has 16 divisors (see below), whose sum is σ = 70077646464. Its totient is φ = 44479641024.

The previous prime is 56577705809. The next prime is 56577705859. The reversal of 56577705821 is 12850777565.

It is not a de Polignac number, because 56577705821 - 2¹⁸ = 56577443677 is a prime.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56577705871) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1965755 + ... + 1994328.

It is an arithmetic number, because the mean of its divisors is an integer number (4379852904).

Almost surely, 2^56577705821 is an apocalyptic number.

It is an amenable number.

56577705821 is a deficient number, since it is larger than the sum of its proper divisors (13499940643).

56577705821 is a wasteful number, since it uses less digits than its factorization.

56577705821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3960260.

The product of its (nonzero) digits is 4116000, while the sum is 53.

The spelling of 56577705821 in words is "fifty-six billion, five hundred seventy-seven million, seven hundred five thousand, eight hundred twenty-one".