165965817 has 16 divisors (see below), whose sum is σ = 233404160. Its totient is φ = 104609232.

The previous prime is 165965809. The next prime is 165965851. The reversal of 165965817 is 718569561.

It is not a de Polignac number, because 165965817 - 2³ = 165965809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165965867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28518 + ... + 33840.

It is an arithmetic number, because the mean of its divisors is an integer number (14587760).

Almost surely, 2^165965817 is an apocalyptic number.

It is an amenable number.

165965817 is a deficient number, since it is larger than the sum of its proper divisors (67438343).

165965817 is a wasteful number, since it uses less digits than its factorization.

165965817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5892.

The product of its digits is 453600, while the sum is 48.

The square root of 165965817 is about 12882.7721007553. The cubic root of 165965817 is about 549.5487394958.

It can be divided in two parts, 1659 and 65817, that added together give a palindrome (67476).

The spelling of 165965817 in words is "one hundred sixty-five million, nine hundred sixty-five thousand, eight hundred seventeen".