664044165 has 12 divisors (see below), whose sum is σ = 1151009964. Its totient is φ = 354156864.

The previous prime is 664044151. The next prime is 664044179. The reversal of 664044165 is 561440466.

664044165 is a `hidden beast` number, since 6 + 640 + 4 + 4 + 1 + 6 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (664044151) and next prime (664044179).

It can be written as a sum of positive squares in 2 ways, for example, as 441378081 + 222666084 = 21009^2 + 14922^2 .

It is not a de Polignac number, because 664044165 - 2⁵ = 664044133 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7378224 + ... + 7378313.

It is an arithmetic number, because the mean of its divisors is an integer number (95917497).

Almost surely, 2^664044165 is an apocalyptic number.

It is an amenable number.

664044165 is a deficient number, since it is larger than the sum of its proper divisors (486965799).

664044165 is a wasteful number, since it uses less digits than its factorization.

664044165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14756548 (or 14756545 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 664044165 is about 25769.0544063999. The cubic root of 664044165 is about 872.4334763171.

It can be divided in two parts, 6640 and 44165, that added together give a palindrome (50805).

The spelling of 664044165 in words is "six hundred sixty-four million, forty-four thousand, one hundred sixty-five".