668198206188 has 72 divisors (see below), whose sum is σ = 1694441688576. Its totient is φ = 222023289600.

The previous prime is 668198206099. The next prime is 668198206201. The reversal of 668198206188 is 881602891866.

668198206188 is a `hidden beast` number, since 6 + 6 + 8 + 1 + 9 + 8 + 2 + 0 + 618 + 8 = 666.

It is a super-2 number, since 2×668198206188² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25646448 + ... + 25672488.

Almost surely, 2^668198206188 is an apocalyptic number.

It is an amenable number.

668198206188 is an abundant number, since it is smaller than the sum of its proper divisors (1026243482388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668198206188 is a wasteful number, since it uses less digits than its factorization.

668198206188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28295 (or 28290 counting only the distinct ones).

The product of its (nonzero) digits is 15925248, while the sum is 63.

The spelling of 668198206188 in words is "six hundred sixty-eight billion, one hundred ninety-eight million, two hundred six thousand, one hundred eighty-eight".