55972779971 has 2 divisors, whose sum is σ = 55972779972. Its totient is φ = 55972779970.

The previous prime is 55972779931. The next prime is 55972779979. The reversal of 55972779971 is 17997727955.

55972779971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55972779971 is a prime.

It is not a weakly prime, because it can be changed into another prime (55972779979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27986389985 + 27986389986.

It is an arithmetic number, because the mean of its divisors is an integer number (27986389986).

Almost surely, 2^55972779971 is an apocalyptic number.

55972779971 is a deficient number, since it is larger than the sum of its proper divisors (1).

55972779971 is an equidigital number, since it uses as much as digits as its factorization.

55972779971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87516450, while the sum is 68.

The spelling of 55972779971 in words is "fifty-five billion, nine hundred seventy-two million, seven hundred seventy-nine thousand, nine hundred seventy-one".