216111664 has 20 divisors (see below), whose sum is σ = 432224320. Its totient is φ = 104569920.

The previous prime is 216111659. The next prime is 216111677. The reversal of 216111664 is 466111612.

216111664 is an admirable number.

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, 217359 + ... + 218350.

It is an arithmetic number, because the mean of its divisors is an integer number (21611216).

Almost surely, 2^216111664 is an apocalyptic number.

It is an amenable number.

216111664 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

216111664 is a wasteful number, since it uses less digits than its factorization.

216111664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435748 (or 435742 counting only the distinct ones).

The product of its digits is 1728, while the sum is 28.

The square root of 216111664 is about 14700.7368522806. The cubic root of 216111664 is about 600.1033747810.

The spelling of 216111664 in words is "two hundred sixteen million, one hundred eleven thousand, six hundred sixty-four".