56651661631 has 2 divisors, whose sum is σ = 56651661632. Its totient is φ = 56651661630.

The previous prime is 56651661601. The next prime is 56651661643. The reversal of 56651661631 is 13616615665.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56651661631 - 2⁷ = 56651661503 is a prime.

It is a super-2 number, since 2×56651661631² (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 (56651661601) 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, 28325830815 + 28325830816.

It is an arithmetic number, because the mean of its divisors is an integer number (28325830816).

Almost surely, 2^56651661631 is an apocalyptic number.

56651661631 is a deficient number, since it is larger than the sum of its proper divisors (1).

56651661631 is an equidigital number, since it uses as much as digits as its factorization.

56651661631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 583200, while the sum is 46.

The spelling of 56651661631 in words is "fifty-six billion, six hundred fifty-one million, six hundred sixty-one thousand, six hundred thirty-one".