666765165 has 32 divisors (see below), whose sum is σ = 1192205952. Its totient is φ = 315392000.

The previous prime is 666765133. The next prime is 666765167. The reversal of 666765165 is 561567666.

It is a happy number.

It is not a de Polignac number, because 666765165 - 2⁵ = 666765133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666765167) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42516 + ... + 56045.

It is an arithmetic number, because the mean of its divisors is an integer number (37256436).

Almost surely, 2^666765165 is an apocalyptic number.

It is an amenable number.

666765165 is a deficient number, since it is larger than the sum of its proper divisors (525440787).

666765165 is a wasteful number, since it uses less digits than its factorization.

666765165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98621.

The product of its digits is 1360800, while the sum is 48.

The square root of 666765165 is about 25821.7963162906. The cubic root of 666765165 is about 873.6234857275.

The spelling of 666765165 in words is "six hundred sixty-six million, seven hundred sixty-five thousand, one hundred sixty-five".