172370319917 has 2 divisors, whose sum is σ = 172370319918. Its totient is φ = 172370319916.

The previous prime is 172370319839. The next prime is 172370319949. The reversal of 172370319917 is 719913073271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95230256836 + 77140063081 = 308594^2 + 277741^2 .

It is a cyclic number.

It is not a de Polignac number, because 172370319917 - 2²⁰ = 172369271341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172370319967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86185159958 + 86185159959.

It is an arithmetic number, because the mean of its divisors is an integer number (86185159959).

Almost surely, 2^172370319917 is an apocalyptic number.

It is an amenable number.

172370319917 is a deficient number, since it is larger than the sum of its proper divisors (1).

172370319917 is an equidigital number, since it uses as much as digits as its factorization.

172370319917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 500094, while the sum is 50.

The spelling of 172370319917 in words is "one hundred seventy-two billion, three hundred seventy million, three hundred nineteen thousand, nine hundred seventeen".