56565656591 has 2 divisors, whose sum is σ = 56565656592. Its totient is φ = 56565656590.

The previous prime is 56565656531. The next prime is 56565656593. The reversal of 56565656591 is 19565656565.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56565656591 - 2⁶ = 56565656527 is a prime.

Together with 56565656593, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56565656591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56565656593) 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, 28282828295 + 28282828296.

It is an arithmetic number, because the mean of its divisors is an integer number (28282828296).

Almost surely, 2^56565656591 is an apocalyptic number.

56565656591 is a deficient number, since it is larger than the sum of its proper divisors (1).

56565656591 is an equidigital number, since it uses as much as digits as its factorization.

56565656591 is an odious number, because the sum of its binary digits is odd.

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

It can be divided in two parts, 565656565 and 91, that multiplied together give a palindrome (51474747415).

The spelling of 56565656591 in words is "fifty-six billion, five hundred sixty-five million, six hundred fifty-six thousand, five hundred ninety-one".