664213373 has 2 divisors, whose sum is σ = 664213374. Its totient is φ = 664213372.

The previous prime is 664213369. The next prime is 664213483. The reversal of 664213373 is 373312466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 475370809 + 188842564 = 21803^2 + 13742^2 .

It is a cyclic number.

It is not a de Polignac number, because 664213373 - 2² = 664213369 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664213313) 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, 332106686 + 332106687.

It is an arithmetic number, because the mean of its divisors is an integer number (332106687).

Almost surely, 2^664213373 is an apocalyptic number.

It is an amenable number.

664213373 is a deficient number, since it is larger than the sum of its proper divisors (1).

664213373 is an equidigital number, since it uses as much as digits as its factorization.

664213373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 35.

The square root of 664213373 is about 25772.3373600456. The cubic root of 664213373 is about 872.5075728880.

The spelling of 664213373 in words is "six hundred sixty-four million, two hundred thirteen thousand, three hundred seventy-three".