166640165 has 16 divisors (see below), whose sum is σ = 210885120. Its totient is φ = 126060480.

The previous prime is 166640143. The next prime is 166640183. The reversal of 166640165 is 561046661.

It is not a de Polignac number, because 166640165 - 2⁶ = 166640101 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63020 + ... + 65610.

It is an arithmetic number, because the mean of its divisors is an integer number (13180320).

Almost surely, 2^166640165 is an apocalyptic number.

It is an amenable number.

166640165 is a deficient number, since it is larger than the sum of its proper divisors (44244955).

166640165 is a wasteful number, since it uses less digits than its factorization.

166640165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3292.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 166640165 is about 12908.9180414162. The cubic root of 166640165 is about 550.2920377445.

The spelling of 166640165 in words is "one hundred sixty-six million, six hundred forty thousand, one hundred sixty-five".