166165 has 8 divisors (see below), whose sum is σ = 201600. Its totient is φ = 131472.

The previous prime is 166157. The next prime is 166169. The reversal of 166165 is 561661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166165 - 2³ = 166157 is a prime.

It is a super-2 number, since 2×166165² = 55221614450, which contains 22 as substring.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 736 + ... + 934.

It is an arithmetic number, because the mean of its divisors is an integer number (25200).

2¹⁶⁶¹⁶⁵ is an apocalyptic number.

It is an amenable number.

166165 is a deficient number, since it is larger than the sum of its proper divisors (35435).

166165 is a wasteful number, since it uses less digits than its factorization.

166165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371.

The product of its digits is 1080, while the sum is 25.

The square root of 166165 is about 407.6334137433. The cubic root of 166165 is about 54.9768497613.

It can be divided in two parts, 1 and 66165, that added together give a palindrome (66166).

The spelling of 166165 in words is "one hundred sixty-six thousand, one hundred sixty-five".