172129208965 has 32 divisors (see below), whose sum is σ = 241134796800. Its totient is φ = 115496545344.

The previous prime is 172129208939. The next prime is 172129209001. The reversal of 172129208965 is 569802921271.

It is a cyclic number.

It is not a de Polignac number, because 172129208965 - 2¹³ = 172129200773 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12467136 + ... + 12480934.

It is an arithmetic number, because the mean of its divisors is an integer number (7535462400).

Almost surely, 2^172129208965 is an apocalyptic number.

It is an amenable number.

172129208965 is a deficient number, since it is larger than the sum of its proper divisors (69005587835).

172129208965 is a wasteful number, since it uses less digits than its factorization.

172129208965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21441.

The product of its (nonzero) digits is 1088640, while the sum is 52.

The spelling of 172129208965 in words is "one hundred seventy-two billion, one hundred twenty-nine million, two hundred eight thousand, nine hundred sixty-five".