167231105721 has 27 divisors (see below), whose sum is σ = 242933648997. Its totient is φ = 110855184120.

The previous prime is 167231105687. The next prime is 167231105729. The reversal of 167231105721 is 127501132761.

The square root of 167231105721 is 408939.

It is a perfect power (a square), and thus also a powerful number.

167231105721 is a `hidden beast` number, since 1 + 6 + 72 + 3 + 1 + 10 + 572 + 1 = 666.

It is not a de Polignac number, because 167231105721 - 2²³ = 167222717113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (167231105729) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 332467156 + ... + 332467658.

Almost surely, 2^167231105721 is an apocalyptic number.

167231105721 is the 408939-th square number.

167231105721 is the 204470-th centered octagonal number.

It is an amenable number.

167231105721 is a deficient number, since it is larger than the sum of its proper divisors (75702543276).

167231105721 is an frugal number, since it uses more digits than its factorization.

167231105721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1554 (or 777 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 36.

Multiplying 167231105721 by its sum of digits (36), we get a square (6020319805956 = 2453634²).

The spelling of 167231105721 in words is "one hundred sixty-seven billion, two hundred thirty-one million, one hundred five thousand, seven hundred twenty-one".