56577556391 has 2 divisors, whose sum is σ = 56577556392. Its totient is φ = 56577556390.

The previous prime is 56577556327. The next prime is 56577556397. The reversal of 56577556391 is 19365577565.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56577556391 - 2⁶ = 56577556327 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56577556391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56577556397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28288778195 + 28288778196.

It is an arithmetic number, because the mean of its divisors is an integer number (28288778196).

Almost surely, 2^56577556391 is an apocalyptic number.

56577556391 is a deficient number, since it is larger than the sum of its proper divisors (1).

56577556391 is an equidigital number, since it uses as much as digits as its factorization.

56577556391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29767500, while the sum is 59.

The spelling of 56577556391 in words is "fifty-six billion, five hundred seventy-seven million, five hundred fifty-six thousand, three hundred ninety-one".