664355506 has 16 divisors (see below), whose sum is σ = 1042372800. Its totient is φ = 316967728.

The previous prime is 664355479. The next prime is 664355507. The reversal of 664355506 is 605553466.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (664355507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2040 + ... + 36508.

It is an arithmetic number, because the mean of its divisors is an integer number (65148300).

Almost surely, 2^664355506 is an apocalyptic number.

664355506 is a deficient number, since it is larger than the sum of its proper divisors (378017294).

664355506 is a wasteful number, since it uses less digits than its factorization.

664355506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34913.

The product of its (nonzero) digits is 324000, while the sum is 40.

The square root of 664355506 is about 25775.0946845982. The cubic root of 664355506 is about 872.5698035302.

The spelling of 664355506 in words is "six hundred sixty-four million, three hundred fifty-five thousand, five hundred six".