668684318 has 8 divisors (see below), whose sum is σ = 1019469720. Its totient is φ = 328861080.

The previous prime is 668684299. The next prime is 668684333. The reversal of 668684318 is 813486866.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2740388 + ... + 2740631.

It is an arithmetic number, because the mean of its divisors is an integer number (127433715).

Almost surely, 2^668684318 is an apocalyptic number.

668684318 is a deficient number, since it is larger than the sum of its proper divisors (350785402).

668684318 is a wasteful number, since it uses less digits than its factorization.

668684318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5481082.

The product of its digits is 1327104, while the sum is 50.

The square root of 668684318 is about 25858.9311070663. The cubic root of 668684318 is about 874.4608675545.

The spelling of 668684318 in words is "six hundred sixty-eight million, six hundred eighty-four thousand, three hundred eighteen".