668194286 has 8 divisors (see below), whose sum is σ = 1025600664. Its totient is φ = 326327400.

The previous prime is 668194271. The next prime is 668194309. The reversal of 668194286 is 682491866.

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, 3884765 + ... + 3884936.

It is an arithmetic number, because the mean of its divisors is an integer number (128200083).

Almost surely, 2^668194286 is an apocalyptic number.

668194286 is a deficient number, since it is larger than the sum of its proper divisors (357406378).

668194286 is a wasteful number, since it uses less digits than its factorization.

668194286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7769746.

The product of its digits is 995328, while the sum is 50.

The square root of 668194286 is about 25849.4542689009. The cubic root of 668194286 is about 874.2472049363.

The spelling of 668194286 in words is "six hundred sixty-eight million, one hundred ninety-four thousand, two hundred eighty-six".