172122112158 has 16 divisors (see below), whose sum is σ = 344508433536. Its totient is φ = 57330002520.

The previous prime is 172122112147. The next prime is 172122112243. The reversal of 172122112158 is 851211221271.

It is a super-2 number, since 2×172122112158² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11000248 + ... + 11015883.

It is an arithmetic number, because the mean of its divisors is an integer number (21531777096).

Almost surely, 2^172122112158 is an apocalyptic number.

172122112158 is an abundant number, since it is smaller than the sum of its proper divisors (172386321378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

172122112158 is a wasteful number, since it uses less digits than its factorization.

172122112158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22017439.

The product of its digits is 4480, while the sum is 33.

The spelling of 172122112158 in words is "one hundred seventy-two billion, one hundred twenty-two million, one hundred twelve thousand, one hundred fifty-eight".