668294018 has 8 divisors (see below), whose sum is σ = 1145646912. Its totient is φ = 286411716.

The previous prime is 668294017. The next prime is 668294027. The reversal of 668294018 is 810492866.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 668294018.

It is not an unprimeable number, because it can be changed into a prime (668294017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23867630 + ... + 23867657.

It is an arithmetic number, because the mean of its divisors is an integer number (143205864).

Almost surely, 2^668294018 is an apocalyptic number.

668294018 is a deficient number, since it is larger than the sum of its proper divisors (477352894).

668294018 is a wasteful number, since it uses less digits than its factorization.

668294018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47735296.

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

The square root of 668294018 is about 25851.3832898745. The cubic root of 668294018 is about 874.2906983166.

The spelling of 668294018 in words is "six hundred sixty-eight million, two hundred ninety-four thousand, eighteen".