166173 has 16 divisors (see below), whose sum is σ = 260736. Its totient is φ = 92160.

The previous prime is 166169. The next prime is 166183. The reversal of 166173 is 371661.

It is not a de Polignac number, because 166173 - 2² = 166169 is a prime.

It is a super-2 number, since 2×166173² = 55226931858, which contains 22 as substring.

166173 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166183) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 765 + ... + 957.

It is an arithmetic number, because the mean of its divisors is an integer number (16296).

2¹⁶⁶¹⁷³ is an apocalyptic number.

It is an amenable number.

166173 is a deficient number, since it is larger than the sum of its proper divisors (94563).

166173 is a wasteful number, since it uses less digits than its factorization.

166173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244.

The product of its digits is 756, while the sum is 24.

The square root of 166173 is about 407.6432263634. The cubic root of 166173 is about 54.9777320324.

The spelling of 166173 in words is "one hundred sixty-six thousand, one hundred seventy-three".