172172166 has 16 divisors (see below), whose sum is σ = 346539504. Its totient is φ = 57024864.

The previous prime is 172172131. The next prime is 172172177. The reversal of 172172166 is 661271271.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90445 + ... + 92328.

It is an arithmetic number, because the mean of its divisors is an integer number (21658719).

Almost surely, 2^172172166 is an apocalyptic number.

172172166 is an abundant number, since it is smaller than the sum of its proper divisors (174367338).

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

172172166 is a wasteful number, since it uses less digits than its factorization.

172172166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182935.

The product of its digits is 7056, while the sum is 33.

The square root of 172172166 is about 13121.4391741150. The cubic root of 172172166 is about 556.3152702772.

The spelling of 172172166 in words is "one hundred seventy-two million, one hundred seventy-two thousand, one hundred sixty-six".