665329165 has 16 divisors (see below), whose sum is σ = 861840000. Its totient is φ = 491563072.

The previous prime is 665329163. The next prime is 665329207. The reversal of 665329165 is 561923566.

It is a cyclic number.

It is not a de Polignac number, because 665329165 - 2¹ = 665329163 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665329163) 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, 96415 + ... + 103084.

It is an arithmetic number, because the mean of its divisors is an integer number (53865000).

Almost surely, 2^665329165 is an apocalyptic number.

It is an amenable number.

665329165 is a deficient number, since it is larger than the sum of its proper divisors (196510835).

665329165 is a wasteful number, since it uses less digits than its factorization.

665329165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199556.

The product of its digits is 291600, while the sum is 43.

The square root of 665329165 is about 25793.9753624756. The cubic root of 665329165 is about 872.9958659471.

The spelling of 665329165 in words is "six hundred sixty-five million, three hundred twenty-nine thousand, one hundred sixty-five".