166670172 has 18 divisors (see below), whose sum is σ = 421305248. Its totient is φ = 55556712.

The previous prime is 166670143. The next prime is 166670173. The reversal of 166670172 is 271076661.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 4629727 = 166670172 / (1 + 6 + 6 + 6 + 7 + 0 + 1 + 7 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166670173) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2314828 + ... + 2314899.

Almost surely, 2^166670172 is an apocalyptic number.

166670172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

166670172 is an abundant number, since it is smaller than the sum of its proper divisors (254635076).

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

166670172 is a wasteful number, since it uses less digits than its factorization.

166670172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4629737 (or 4629732 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 166670172 is about 12910.0802476205. The cubic root of 166670172 is about 550.3250662406.

The spelling of 166670172 in words is "one hundred sixty-six million, six hundred seventy thousand, one hundred seventy-two".