664304317065 has 20 divisors (see below), whose sum is σ = 1190826998724. Its totient is φ = 354295635552.

The previous prime is 664304317043. The next prime is 664304317067. The reversal of 664304317065 is 560713403466.

664304317065 is a `hidden beast` number, since 6 + 6 + 430 + 43 + 170 + 6 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 82214666361 + 582089650704 = 286731^2 + 762948^2 .

It is not a de Polignac number, because 664304317065 - 2¹⁶ = 664304251529 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 664304317065.

It is not an unprimeable number, because it can be changed into a prime (664304317067) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 820128382 + ... + 820129191.

Almost surely, 2^664304317065 is an apocalyptic number.

It is an amenable number.

664304317065 is a deficient number, since it is larger than the sum of its proper divisors (526522681659).

664304317065 is a wasteful number, since it uses less digits than its factorization.

664304317065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1640257590 (or 1640257581 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 45.

The spelling of 664304317065 in words is "six hundred sixty-four billion, three hundred four million, three hundred seventeen thousand, sixty-five".