55971222917 has 2 divisors, whose sum is σ = 55971222918. Its totient is φ = 55971222916.

The previous prime is 55971222907. The next prime is 55971222961. The reversal of 55971222917 is 71922217955.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55772017921 + 199204996 = 236161^2 + 14114^2 .

It is a cyclic number.

It is not a de Polignac number, because 55971222917 - 2¹⁶ = 55971157381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55971222907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27985611458 + 27985611459.

It is an arithmetic number, because the mean of its divisors is an integer number (27985611459).

Almost surely, 2^55971222917 is an apocalyptic number.

It is an amenable number.

55971222917 is a deficient number, since it is larger than the sum of its proper divisors (1).

55971222917 is an equidigital number, since it uses as much as digits as its factorization.

55971222917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 793800, while the sum is 50.

The spelling of 55971222917 in words is "fifty-five billion, nine hundred seventy-one million, two hundred twenty-two thousand, nine hundred seventeen".