664706506 has 16 divisors (see below), whose sum is σ = 1032688800. Its totient is φ = 320504688.

The previous prime is 664706503. The next prime is 664706521. The reversal of 664706506 is 605607466.

It is not an unprimeable number, because it can be changed into a prime (664706501) 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, 44725 + ... + 57703.

It is an arithmetic number, because the mean of its divisors is an integer number (64543050).

Almost surely, 2^664706506 is an apocalyptic number.

664706506 is a deficient number, since it is larger than the sum of its proper divisors (367982294).

664706506 is a wasteful number, since it uses less digits than its factorization.

664706506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13893.

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 664706506 is about 25781.9026838595. The cubic root of 664706506 is about 872.7234452056.

The spelling of 664706506 in words is "six hundred sixty-four million, seven hundred six thousand, five hundred six".