166370173225 has 45 divisors (see below), whose sum is σ = 215892285897. Its totient is φ = 127181806080.

The previous prime is 166370173217. The next prime is 166370173231. The reversal of 166370173225 is 522371073661.

The square root of 166370173225 is 407885.

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

It can be written as a sum of positive squares in 22 ways, for example, as 162935744409 + 3434428816 = 403653^2 + 58604^2 .

It is not a de Polignac number, because 166370173225 - 2³ = 166370173217 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 1715156377 + ... + 1715156473.

Almost surely, 2^166370173225 is an apocalyptic number.

166370173225 is the 407885-th square number.

166370173225 is the 203943-rd centered octagonal number.

It is an amenable number.

166370173225 is a deficient number, since it is larger than the sum of its proper divisors (49522112672).

166370173225 is an frugal number, since it uses more digits than its factorization.

166370173225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320 (or 131 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 43.

The spelling of 166370173225 in words is "one hundred sixty-six billion, three hundred seventy million, one hundred seventy-three thousand, two hundred twenty-five".