664566465 has 32 divisors (see below), whose sum is σ = 1164689280. Its totient is φ = 322079744.

The previous prime is 664566457. The next prime is 664566479. The reversal of 664566465 is 564665466.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 664566465 - 2³ = 664566457 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37539 + ... + 52328.

It is an arithmetic number, because the mean of its divisors is an integer number (36396540).

Almost surely, 2^664566465 is an apocalyptic number.

It is an amenable number.

664566465 is a deficient number, since it is larger than the sum of its proper divisors (500122815).

664566465 is a wasteful number, since it uses less digits than its factorization.

664566465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89921.

The product of its digits is 3110400, while the sum is 48.

The square root of 664566465 is about 25779.1866628876. The cubic root of 664566465 is about 872.6621521653.

Subtracting from 664566465 its reverse (564665466), we obtain a palindrome (99900999).

The spelling of 664566465 in words is "six hundred sixty-four million, five hundred sixty-six thousand, four hundred sixty-five".