56558431591 has 2 divisors, whose sum is σ = 56558431592. Its totient is φ = 56558431590.

The previous prime is 56558431577. The next prime is 56558431597. The reversal of 56558431591 is 19513485565.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56558431591 - 2⁷ = 56558431463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56558431597) 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 as a sum of consecutive naturals, namely, 28279215795 + 28279215796.

It is an arithmetic number, because the mean of its divisors is an integer number (28279215796).

Almost surely, 2^56558431591 is an apocalyptic number.

56558431591 is a deficient number, since it is larger than the sum of its proper divisors (1).

56558431591 is an equidigital number, since it uses as much as digits as its factorization.

56558431591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240000, while the sum is 52.

The spelling of 56558431591 in words is "fifty-six billion, five hundred fifty-eight million, four hundred thirty-one thousand, five hundred ninety-one".