56577540391 has 2 divisors, whose sum is σ = 56577540392. Its totient is φ = 56577540390.

The previous prime is 56577540373. The next prime is 56577540497. The reversal of 56577540391 is 19304577565.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56577540391 - 2⁵ = 56577540359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56577540361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28288770195 + 28288770196.

It is an arithmetic number, because the mean of its divisors is an integer number (28288770196).

Almost surely, 2^56577540391 is an apocalyptic number.

56577540391 is a deficient number, since it is larger than the sum of its proper divisors (1).

56577540391 is an equidigital number, since it uses as much as digits as its factorization.

56577540391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3969000, while the sum is 52.

The spelling of 56577540391 in words is "fifty-six billion, five hundred seventy-seven million, five hundred forty thousand, three hundred ninety-one".