56691819631 has 2 divisors, whose sum is σ = 56691819632. Its totient is φ = 56691819630.

The previous prime is 56691819581. The next prime is 56691819659. The reversal of 56691819631 is 13691819665.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56691819631 - 2¹⁵ = 56691786863 is a prime.

It is a super-2 number, since 2×56691819631² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56691817631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28345909815 + 28345909816.

It is an arithmetic number, because the mean of its divisors is an integer number (28345909816).

Almost surely, 2^56691819631 is an apocalyptic number.

56691819631 is a deficient number, since it is larger than the sum of its proper divisors (1).

56691819631 is an equidigital number, since it uses as much as digits as its factorization.

56691819631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2099520, while the sum is 55.

The spelling of 56691819631 in words is "fifty-six billion, six hundred ninety-one million, eight hundred nineteen thousand, six hundred thirty-one".