166690172 has 12 divisors (see below), whose sum is σ = 318226776. Its totient is φ = 75768240.

The previous prime is 166690169. The next prime is 166690187. The reversal of 166690172 is 271096661.

It is a super-2 number, since 2×166690172² = 55571226882779168, which contains 22 as substring.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1894163 + ... + 1894250.

It is an arithmetic number, because the mean of its divisors is an integer number (26518898).

Almost surely, 2^166690172 is an apocalyptic number.

It is an amenable number.

166690172 is a deficient number, since it is larger than the sum of its proper divisors (151536604).

166690172 is a wasteful number, since it uses less digits than its factorization.

166690172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3788428 (or 3788426 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 166690172 is about 12910.8548129084. The cubic root of 166690172 is about 550.3470778999.

The spelling of 166690172 in words is "one hundred sixty-six million, six hundred ninety thousand, one hundred seventy-two".