664621313 has 4 divisors (see below), whose sum is σ = 678762240. Its totient is φ = 650480388.

The previous prime is 664621303. The next prime is 664621337. The reversal of 664621313 is 313126466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 313126466 = 2 ⋅156563233.

It is a cyclic number.

It is not a de Polignac number, because 664621313 - 2⁴ = 664621297 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 664621313.

It is not an unprimeable number, because it can be changed into a prime (664621303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7070393 + ... + 7070486.

It is an arithmetic number, because the mean of its divisors is an integer number (169690560).

Almost surely, 2^664621313 is an apocalyptic number.

It is an amenable number.

664621313 is a deficient number, since it is larger than the sum of its proper divisors (14140927).

664621313 is a wasteful number, since it uses less digits than its factorization.

664621313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14140926.

The product of its digits is 15552, while the sum is 32.

The square root of 664621313 is about 25780.2504448657. The cubic root of 664621313 is about 872.6861590227.

Adding to 664621313 its reverse (313126466), we get a palindrome (977747779).

The spelling of 664621313 in words is "six hundred sixty-four million, six hundred twenty-one thousand, three hundred thirteen".