668389317 has 4 divisors (see below), whose sum is σ = 891185760. Its totient is φ = 445592876.

The previous prime is 668389279. The next prime is 668389331. The reversal of 668389317 is 713983866.

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.

It is a cyclic number.

It is not a de Polignac number, because 668389317 - 2²⁰ = 667340741 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 668389317.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668389367) 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 in 3 ways as a sum of consecutive naturals, for example, 111398217 + ... + 111398222.

It is an arithmetic number, because the mean of its divisors is an integer number (222796440).

Almost surely, 2^668389317 is an apocalyptic number.

It is an amenable number.

668389317 is a deficient number, since it is larger than the sum of its proper divisors (222796443).

668389317 is a wasteful number, since it uses less digits than its factorization.

668389317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222796442.

The product of its digits is 1306368, while the sum is 51.

The square root of 668389317 is about 25853.2264330779. The cubic root of 668389317 is about 874.3322544117.

The spelling of 668389317 in words is "six hundred sixty-eight million, three hundred eighty-nine thousand, three hundred seventeen".