664986313 has 4 divisors (see below), whose sum is σ = 671841940. Its totient is φ = 658130688.

The previous prime is 664986307. The next prime is 664986319. The reversal of 664986313 is 313689466.

664986313 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 313689466 = 2 ⋅156844733.

It is an interprime number because it is at equal distance from previous prime (664986307) and next prime (664986319).

It can be written as a sum of positive squares in 2 ways, for example, as 396288649 + 268697664 = 19907^2 + 16392^2 .

It is a cyclic number.

It is not a de Polignac number, because 664986313 - 2⁹ = 664985801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664986319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3427668 + ... + 3427861.

It is an arithmetic number, because the mean of its divisors is an integer number (167960485).

Almost surely, 2^664986313 is an apocalyptic number.

It is an amenable number.

664986313 is a deficient number, since it is larger than the sum of its proper divisors (6855627).

664986313 is an equidigital number, since it uses as much as digits as its factorization.

664986313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6855626.

The product of its digits is 559872, while the sum is 46.

The square root of 664986313 is about 25787.3285355424. The cubic root of 664986313 is about 872.8458851449.

The spelling of 664986313 in words is "six hundred sixty-four million, nine hundred eighty-six thousand, three hundred thirteen".