55972779931 has 2 divisors, whose sum is σ = 55972779932. Its totient is φ = 55972779930.

The previous prime is 55972779913. The next prime is 55972779971. The reversal of 55972779931 is 13997727955.

Together with previous prime (55972779913) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55972779931 - 2²⁹ = 55435909019 is a prime.

It is a super-2 number, since 2×55972779931² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55972779971) 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, 27986389965 + 27986389966.

It is an arithmetic number, because the mean of its divisors is an integer number (27986389966).

Almost surely, 2^55972779931 is an apocalyptic number.

55972779931 is a deficient number, since it is larger than the sum of its proper divisors (1).

55972779931 is an equidigital number, since it uses as much as digits as its factorization.

55972779931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37507050, while the sum is 64.

The spelling of 55972779931 in words is "fifty-five billion, nine hundred seventy-two million, seven hundred seventy-nine thousand, nine hundred thirty-one".