664051365 has 80 divisors (see below), whose sum is σ = 1290282048. Its totient is φ = 325430784.

The previous prime is 664051361. The next prime is 664051369. The reversal of 664051365 is 563150466.

664051365 is a `hidden beast` number, since 6 + 640 + 5 + 1 + 3 + 6 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (664051361) and next prime (664051369).

It is not a de Polignac number, because 664051365 - 2² = 664051361 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664051361) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 294934 + ... + 297176.

Almost surely, 2^664051365 is an apocalyptic number.

It is an amenable number.

664051365 is a deficient number, since it is larger than the sum of its proper divisors (626230683).

664051365 is a wasteful number, since it uses less digits than its factorization.

664051365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2320 (or 2311 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 664051365 is about 25769.1941084699. The cubic root of 664051365 is about 872.4366294700.

The spelling of 664051365 in words is "six hundred sixty-four million, fifty-one thousand, three hundred sixty-five".