16685172172 has 12 divisors (see below), whose sum is σ = 30916642680. Its totient is φ = 7851845696.

The previous prime is 16685172167. The next prime is 16685172227. The reversal of 16685172172 is 27127158661.

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, 122685022 + ... + 122685157.

It is an arithmetic number, because the mean of its divisors is an integer number (2576386890).

Almost surely, 2^16685172172 is an apocalyptic number.

It is an amenable number.

16685172172 is a deficient number, since it is larger than the sum of its proper divisors (14231470508).

16685172172 is a wasteful number, since it uses less digits than its factorization.

16685172172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245370200 (or 245370198 counting only the distinct ones).

The product of its digits is 282240, while the sum is 46.

The spelling of 16685172172 in words is "sixteen billion, six hundred eighty-five million, one hundred seventy-two thousand, one hundred seventy-two".