166794121668 has 12 divisors (see below), whose sum is σ = 389186283920. Its totient is φ = 55598040552.

The previous prime is 166794121607. The next prime is 166794121679. The reversal of 166794121668 is 866121497661.

It is a tau number, because it is divible by the number of its divisors (12).

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, 6949755058 + ... + 6949755081.

Almost surely, 2^166794121668 is an apocalyptic number.

It is an amenable number.

166794121668 is an abundant number, since it is smaller than the sum of its proper divisors (222392162252).

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

166794121668 is a wasteful number, since it uses less digits than its factorization.

166794121668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13899510146 (or 13899510144 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 57.

The spelling of 166794121668 in words is "one hundred sixty-six billion, seven hundred ninety-four million, one hundred twenty-one thousand, six hundred sixty-eight".