56577570661 has 4 divisors (see below), whose sum is σ = 56578066924. Its totient is φ = 56577074400.

The previous prime is 56577570601. The next prime is 56577570689. The reversal of 56577570661 is 16607577565.

It is a happy number.

56577570661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16607577565 = 5 ⋅3321515513.

It can be written as a sum of positive squares in 2 ways, for example, as 20361577636 + 36215993025 = 142694^2 + 190305^2 .

It is a cyclic number.

It is not a de Polignac number, because 56577570661 - 2²¹ = 56575473509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56577570601) 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, 18091 + ... + 336871.

It is an arithmetic number, because the mean of its divisors is an integer number (14144516731).

Almost surely, 2^56577570661 is an apocalyptic number.

It is an amenable number.

56577570661 is a deficient number, since it is larger than the sum of its proper divisors (496263).

56577570661 is a wasteful number, since it uses less digits than its factorization.

56577570661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496262.

The product of its (nonzero) digits is 9261000, while the sum is 55.

The spelling of 56577570661 in words is "fifty-six billion, five hundred seventy-seven million, five hundred seventy thousand, six hundred sixty-one".