166165615 has 24 divisors (see below), whose sum is σ = 253044432. Its totient is φ = 103582080.

The previous prime is 166165609. The next prime is 166165619. The reversal of 166165615 is 516561661.

It is not a de Polignac number, because 166165615 - 2¹⁹ = 165641327 is a prime.

It is a super-2 number, since 2×166165615² = 55222023216656450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166165619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28134 + ... + 33523.

It is an arithmetic number, because the mean of its divisors is an integer number (10543518).

Almost surely, 2^166165615 is an apocalyptic number.

166165615 is a deficient number, since it is larger than the sum of its proper divisors (86878817).

166165615 is a wasteful number, since it uses less digits than its factorization.

166165615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61687 (or 61680 counting only the distinct ones).

The product of its digits is 32400, while the sum is 37.

The square root of 166165615 is about 12890.5242329395. The cubic root of 166165615 is about 549.7691758685.

It can be divided in two parts, 1661 and 65615, that added together give a palindrome (67276).

The spelling of 166165615 in words is "one hundred sixty-six million, one hundred sixty-five thousand, six hundred fifteen".