665136165 has 16 divisors (see below), whose sum is σ = 1079208576. Its totient is φ = 349742400.

The previous prime is 665136119. The next prime is 665136179. The reversal of 665136165 is 561631566.

It is not a de Polignac number, because 665136165 - 2⁷ = 665136037 is a prime.

It is a super-2 number, since 2×665136165² = 884812235981814450, which contains 22 as substring.

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, 311206 + ... + 313335.

It is an arithmetic number, because the mean of its divisors is an integer number (67450536).

Almost surely, 2^665136165 is an apocalyptic number.

It is an amenable number.

665136165 is a deficient number, since it is larger than the sum of its proper divisors (414072411).

665136165 is a wasteful number, since it uses less digits than its factorization.

665136165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624620.

The product of its digits is 97200, while the sum is 39.

The square root of 665136165 is about 25790.2339074309. The cubic root of 665136165 is about 872.9114443278.

The spelling of 665136165 in words is "six hundred sixty-five million, one hundred thirty-six thousand, one hundred sixty-five".