172866974844917 has 12 divisors (see below), whose sum is σ = 182564837080416. Its totient is φ = 163660328170920.

The previous prime is 172866974844913. The next prime is 172866974844919. The reversal of 172866974844917 is 719448479668271.

It is a happy number.

It is not a de Polignac number, because 172866974844917 - 2² = 172866974844913 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172866974844911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 157911143 + ... + 159002084.

It is an arithmetic number, because the mean of its divisors is an integer number (15213736423368).

Almost surely, 2^{172866974844917} is an apocalyptic number.

It is an amenable number.

172866974844917 is a deficient number, since it is larger than the sum of its proper divisors (9697862235499).

172866974844917 is a wasteful number, since it uses less digits than its factorization.

172866974844917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316914776 (or 316914757 counting only the distinct ones).

The product of its digits is 8193540096, while the sum is 83.

The spelling of 172866974844917 in words is "one hundred seventy-two trillion, eight hundred sixty-six billion, nine hundred seventy-four million, eight hundred forty-four thousand, nine hundred seventeen".