166851868688 has 20 divisors (see below), whose sum is σ = 330793531728. Its totient is φ = 81485796000.

The previous prime is 166851868657. The next prime is 166851868691. The reversal of 166851868688 is 886868158661.

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, 121257938 + ... + 121259313.

Almost surely, 2^166851868688 is an apocalyptic number.

It is an amenable number.

166851868688 is a deficient number, since it is larger than the sum of its proper divisors (163941663040).

166851868688 is a wasteful number, since it uses less digits than its factorization.

166851868688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242517302 (or 242517296 counting only the distinct ones).

The product of its digits is 212336640, while the sum is 71.

The spelling of 166851868688 in words is "one hundred sixty-six billion, eight hundred fifty-one million, eight hundred sixty-eight thousand, six hundred eighty-eight".