172168647817 has 2 divisors, whose sum is σ = 172168647818. Its totient is φ = 172168647816.

The previous prime is 172168647779. The next prime is 172168647841. The reversal of 172168647817 is 718746861271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171577379961 + 591267856 = 414219^2 + 24316^2 .

It is a cyclic number.

It is not a de Polignac number, because 172168647817 - 2²³ = 172160259209 is a prime.

It is a super-2 number, since 2×172168647817² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (172168647017) 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, 86084323908 + 86084323909.

It is an arithmetic number, because the mean of its divisors is an integer number (86084323909).

Almost surely, 2^172168647817 is an apocalyptic number.

It is an amenable number.

172168647817 is a deficient number, since it is larger than the sum of its proper divisors (1).

172168647817 is an equidigital number, since it uses as much as digits as its factorization.

172168647817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6322176, while the sum is 58.

The spelling of 172168647817 in words is "one hundred seventy-two billion, one hundred sixty-eight million, six hundred forty-seven thousand, eight hundred seventeen".