664706507 has 4 divisors (see below), whose sum is σ = 699691080. Its totient is φ = 629721936.

The previous prime is 664706503. The next prime is 664706521. The reversal of 664706507 is 705607466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 705607466 = 2 ⋅352803733.

It is a cyclic number.

It is not a de Polignac number, because 664706507 - 2² = 664706503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664706501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17492258 + ... + 17492295.

It is an arithmetic number, because the mean of its divisors is an integer number (174922770).

Almost surely, 2^664706507 is an apocalyptic number.

664706507 is a deficient number, since it is larger than the sum of its proper divisors (34984573).

664706507 is a wasteful number, since it uses less digits than its factorization.

664706507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34984572.

The product of its (nonzero) digits is 211680, while the sum is 41.

The square root of 664706507 is about 25781.9027032529. The cubic root of 664706507 is about 872.7234456433.

The spelling of 664706507 in words is "six hundred sixty-four million, seven hundred six thousand, five hundred seven".