166661511056 has 40 divisors (see below), whose sum is σ = 333637645824. Its totient is φ = 80566548480.

The previous prime is 166661511017. The next prime is 166661511061. The reversal of 166661511056 is 650115166661.

It is a junction number, because it is equal to n+sod(n) for n = 166661510998 and 166661511016.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 369200 + ... + 685296.

Almost surely, 2^166661511056 is an apocalyptic number.

166661511056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

166661511056 is an abundant number, since it is smaller than the sum of its proper divisors (166976134768).

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

166661511056 is a wasteful number, since it uses less digits than its factorization.

166661511056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317199 (or 317193 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 44.

The spelling of 166661511056 in words is "one hundred sixty-six billion, six hundred sixty-one million, five hundred eleven thousand, fifty-six".