664304565 has 16 divisors (see below), whose sum is σ = 1063254528. Its totient is φ = 354173376.

The previous prime is 664304539. The next prime is 664304569. The reversal of 664304565 is 565403466.

It is not a de Polignac number, because 664304565 - 2⁸ = 664304309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664304569) 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, 52444 + ... + 63866.

It is an arithmetic number, because the mean of its divisors is an integer number (66453408).

Almost surely, 2^664304565 is an apocalyptic number.

It is an amenable number.

664304565 is a deficient number, since it is larger than the sum of its proper divisors (398949963).

664304565 is a wasteful number, since it uses less digits than its factorization.

664304565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15308.

The product of its (nonzero) digits is 259200, while the sum is 39.

The square root of 664304565 is about 25774.1064830578. The cubic root of 664304565 is about 872.5475008553.

The spelling of 664304565 in words is "six hundred sixty-four million, three hundred four thousand, five hundred sixty-five".