668381318 has 8 divisors (see below), whose sum is σ = 1093714920. Its totient is φ = 303809680.

The previous prime is 668381309. The next prime is 668381339. The reversal of 668381318 is 813183866.

668381318 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 15190463 + ... + 15190506.

It is an arithmetic number, because the mean of its divisors is an integer number (136714365).

Almost surely, 2^668381318 is an apocalyptic number.

668381318 is a deficient number, since it is larger than the sum of its proper divisors (425333602).

668381318 is a wasteful number, since it uses less digits than its factorization.

668381318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30380982.

The product of its digits is 165888, while the sum is 44.

The square root of 668381318 is about 25853.0717323880. The cubic root of 668381318 is about 874.3287665185.

The spelling of 668381318 in words is "six hundred sixty-eight million, three hundred eighty-one thousand, three hundred eighteen".