668193208 has 16 divisors (see below), whose sum is σ = 1253349000. Its totient is φ = 333966816.

The previous prime is 668193199. The next prime is 668193209. The reversal of 668193208 is 802391866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668193209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7738 + ... + 37366.

Almost surely, 2^668193208 is an apocalyptic number.

It is an amenable number.

668193208 is a deficient number, since it is larger than the sum of its proper divisors (585155792).

668193208 is a wasteful number, since it uses less digits than its factorization.

668193208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32454 (or 32450 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 668193208 is about 25849.4334173885. The cubic root of 668193208 is about 874.2467347941.

The spelling of 668193208 in words is "six hundred sixty-eight million, one hundred ninety-three thousand, two hundred eight".