664377365 has 16 divisors (see below), whose sum is σ = 822367728. Its totient is φ = 514884096.

The previous prime is 664377361. The next prime is 664377403. The reversal of 664377365 is 563773466.

It can be written as a sum of positive squares in 8 ways, for example, as 27269284 + 637108081 = 5222^2 + 25241^2 .

It is a cyclic number.

It is not a de Polignac number, because 664377365 - 2² = 664377361 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664377361) 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, 35399 + ... + 50811.

It is an arithmetic number, because the mean of its divisors is an integer number (51397983).

Almost surely, 2^664377365 is an apocalyptic number.

It is an amenable number.

664377365 is a deficient number, since it is larger than the sum of its proper divisors (157990363).

664377365 is a wasteful number, since it uses less digits than its factorization.

664377365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15688.

The product of its digits is 1905120, while the sum is 47.

The square root of 664377365 is about 25775.5187144701. The cubic root of 664377365 is about 872.5793733533.

The spelling of 664377365 in words is "six hundred sixty-four million, three hundred seventy-seven thousand, three hundred sixty-five".