664507 has 2 divisors, whose sum is σ = 664508. Its totient is φ = 664506.

The previous prime is 664471. The next prime is 664511. The reversal of 664507 is 705466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664507 - 2⁷ = 664379 is a prime.

It is not a weakly prime, because it can be changed into another prime (664537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332253 + 332254.

It is an arithmetic number, because the mean of its divisors is an integer number (332254).

2⁶⁶⁴⁵⁰⁷ is an apocalyptic number.

664507 is a deficient number, since it is larger than the sum of its proper divisors (1).

664507 is an equidigital number, since it uses as much as digits as its factorization.

664507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 664507 is about 815.1729877762. The cubic root of 664507 is about 87.2636122964.

The spelling of 664507 in words is "six hundred sixty-four thousand, five hundred seven".