664321313 has 2 divisors, whose sum is σ = 664321314. Its totient is φ = 664321312.

The previous prime is 664321309. The next prime is 664321321. The reversal of 664321313 is 313123466.

664321313 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 518563984 + 145757329 = 22772^2 + 12073^2 .

It is a cyclic number.

It is not a de Polignac number, because 664321313 - 2² = 664321309 is a prime.

It is not a weakly prime, because it can be changed into another prime (664321913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332160656 + 332160657.

It is an arithmetic number, because the mean of its divisors is an integer number (332160657).

Almost surely, 2^664321313 is an apocalyptic number.

It is an amenable number.

664321313 is a deficient number, since it is larger than the sum of its proper divisors (1).

664321313 is an equidigital number, since it uses as much as digits as its factorization.

664321313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 29.

The square root of 664321313 is about 25774.4313807308. The cubic root of 664321313 is about 872.5548334873.

Adding to 664321313 its reverse (313123466), we get a palindrome (977444779).

The spelling of 664321313 in words is "six hundred sixty-four million, three hundred twenty-one thousand, three hundred thirteen".