166171 has 4 divisors (see below), whose sum is σ = 167832. Its totient is φ = 164512.

The previous prime is 166169. The next prime is 166183. The reversal of 166171 is 171661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166171 - 2¹ = 166169 is a prime.

It is a super-2 number, since 2×166171² = 55225602482, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 670 + ... + 883.

It is an arithmetic number, because the mean of its divisors is an integer number (41958).

2¹⁶⁶¹⁷¹ is an apocalyptic number.

166171 is a deficient number, since it is larger than the sum of its proper divisors (1661).

166171 is a wasteful number, since it uses less digits than its factorization.

166171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1660.

The product of its digits is 252, while the sum is 22.

The square root of 166171 is about 407.6407732305. The cubic root of 166171 is about 54.9775114672.

The spelling of 166171 in words is "one hundred sixty-six thousand, one hundred seventy-one".