664715773 has 2 divisors, whose sum is σ = 664715774. Its totient is φ = 664715772.

The previous prime is 664715743. The next prime is 664715791. The reversal of 664715773 is 377517466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 611177284 + 53538489 = 24722^2 + 7317^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664715773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664715713) 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 as a sum of consecutive naturals, namely, 332357886 + 332357887.

It is an arithmetic number, because the mean of its divisors is an integer number (332357887).

Almost surely, 2^664715773 is an apocalyptic number.

It is an amenable number.

664715773 is a deficient number, since it is larger than the sum of its proper divisors (1).

664715773 is an equidigital number, since it uses as much as digits as its factorization.

664715773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 740880, while the sum is 46.

The square root of 664715773 is about 25782.0824023196. The cubic root of 664715773 is about 872.7275008756.

The spelling of 664715773 in words is "six hundred sixty-four million, seven hundred fifteen thousand, seven hundred seventy-three".