664823457313 has 4 divisors (see below), whose sum is σ = 682791658900. Its totient is φ = 646855255728.

The previous prime is 664823457217. The next prime is 664823457367. The reversal of 664823457313 is 313754328466.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 306109905984 + 358713551329 = 553272^2 + 598927^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664823457313 is a prime.

It is a super-2 number, since 2×664823457313² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664823457413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8984100738 + ... + 8984100811.

It is an arithmetic number, because the mean of its divisors is an integer number (170697914725).

Almost surely, 2^664823457313 is an apocalyptic number.

It is an amenable number.

664823457313 is a deficient number, since it is larger than the sum of its proper divisors (17968201587).

664823457313 is a wasteful number, since it uses less digits than its factorization.

664823457313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17968201586.

The product of its digits is 8709120, while the sum is 52.

The spelling of 664823457313 in words is "six hundred sixty-four billion, eight hundred twenty-three million, four hundred fifty-seven thousand, three hundred thirteen".