172166 has 4 divisors (see below), whose sum is σ = 258252. Its totient is φ = 86082.

The previous prime is 172157. The next prime is 172169. The reversal of 172166 is 661271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 661271 = 13 ⋅50867.

It is a super-2 number, since 2×172166² = 59282263112, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 172166.

It is not an unprimeable number, because it can be changed into a prime (172169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43040 + ... + 43043.

It is an arithmetic number, because the mean of its divisors is an integer number (64563).

2¹⁷²¹⁶⁶ is an apocalyptic number.

172166 is a deficient number, since it is larger than the sum of its proper divisors (86086).

172166 is an equidigital number, since it uses as much as digits as its factorization.

172166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86085.

The product of its digits is 504, while the sum is 23.

The square root of 172166 is about 414.9289095737. The cubic root of 172166 is about 55.6308629094.

The spelling of 172166 in words is "one hundred seventy-two thousand, one hundred sixty-six".