56565565691 has 2 divisors, whose sum is σ = 56565565692. Its totient is φ = 56565565690.

The previous prime is 56565565669. The next prime is 56565565709. The reversal of 56565565691 is 19656556565.

56565565691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56565565691 - 2¹⁰ = 56565564667 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56565565691.

It is not a weakly prime, because it can be changed into another prime (56565565891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28282782845 + 28282782846.

It is an arithmetic number, because the mean of its divisors is an integer number (28282782846).

Almost surely, 2^56565565691 is an apocalyptic number.

56565565691 is a deficient number, since it is larger than the sum of its proper divisors (1).

56565565691 is an equidigital number, since it uses as much as digits as its factorization.

56565565691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36450000, while the sum is 59.

The spelling of 56565565691 in words is "fifty-six billion, five hundred sixty-five million, five hundred sixty-five thousand, six hundred ninety-one".