165608165 has 16 divisors (see below), whose sum is σ = 210221568. Its totient is φ = 124983936.

The previous prime is 165608159. The next prime is 165608171. The reversal of 165608165 is 561806561.

It is an interprime number because it is at equal distance from previous prime (165608159) and next prime (165608171).

It is a cyclic number.

It is not a de Polignac number, because 165608165 - 2²⁴ = 148830949 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1469 + ... + 18258.

It is an arithmetic number, because the mean of its divisors is an integer number (13138848).

Almost surely, 2^165608165 is an apocalyptic number.

It is an amenable number.

165608165 is a deficient number, since it is larger than the sum of its proper divisors (44613403).

165608165 is a wasteful number, since it uses less digits than its factorization.

165608165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19828.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 165608165 is about 12868.8835957126. The cubic root of 165608165 is about 549.1537012015.

The spelling of 165608165 in words is "one hundred sixty-five million, six hundred eight thousand, one hundred sixty-five".