166820112972 has 72 divisors (see below), whose sum is σ = 423448736256. Its totient is φ = 55374511584.

The previous prime is 166820112967. The next prime is 166820113007. The reversal of 166820112972 is 279211028661.

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, 8446573 + ... + 8466299.

It is an arithmetic number, because the mean of its divisors is an integer number (5881232448).

Almost surely, 2^166820112972 is an apocalyptic number.

166820112972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

166820112972 is an abundant number, since it is smaller than the sum of its proper divisors (256628623284).

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

166820112972 is a wasteful number, since it uses less digits than its factorization.

166820112972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20707 (or 20702 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The spelling of 166820112972 in words is "one hundred sixty-six billion, eight hundred twenty million, one hundred twelve thousand, nine hundred seventy-two".