664744957 has 2 divisors, whose sum is σ = 664744958. Its totient is φ = 664744956.

The previous prime is 664744939. The next prime is 664745063. The reversal of 664744957 is 759447466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 613751076 + 50993881 = 24774^2 + 7141^2 .

It is a cyclic number.

It is not a de Polignac number, because 664744957 - 2¹¹ = 664742909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664744657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332372478 + 332372479.

It is an arithmetic number, because the mean of its divisors is an integer number (332372479).

Almost surely, 2^664744957 is an apocalyptic number.

It is an amenable number.

664744957 is a deficient number, since it is larger than the sum of its proper divisors (1).

664744957 is an equidigital number, since it uses as much as digits as its factorization.

664744957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5080320, while the sum is 52.

The square root of 664744957 is about 25782.6483705612. The cubic root of 664744957 is about 872.7402729042.

The spelling of 664744957 in words is "six hundred sixty-four million, seven hundred forty-four thousand, nine hundred fifty-seven".