668319692 has 6 divisors (see below), whose sum is σ = 1169559468. Its totient is φ = 334159844.

The previous prime is 668319689. The next prime is 668319709. The reversal of 668319692 is 296913866.

It is a self number, because there is not a number n which added to its sum of digits gives 668319692.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83539958 + ... + 83539965.

It is an arithmetic number, because the mean of its divisors is an integer number (194926578).

Almost surely, 2^668319692 is an apocalyptic number.

It is an amenable number.

668319692 is a deficient number, since it is larger than the sum of its proper divisors (501239776).

668319692 is a wasteful number, since it uses less digits than its factorization.

668319692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167079927 (or 167079925 counting only the distinct ones).

The product of its digits is 839808, while the sum is 50.

The square root of 668319692 is about 25851.8798542775. The cubic root of 668319692 is about 874.3018941134.

The spelling of 668319692 in words is "six hundred sixty-eight million, three hundred nineteen thousand, six hundred ninety-two".