216661152 has 24 divisors (see below), whose sum is σ = 568735776. Its totient is φ = 72220352.

The previous prime is 216661087. The next prime is 216661177. The reversal of 216661152 is 251166612.

It is a tau number, because it is divible by the number of its divisors (24).

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, 1128348 + ... + 1128539.

It is an arithmetic number, because the mean of its divisors is an integer number (23697324).

Almost surely, 2^216661152 is an apocalyptic number.

It is an amenable number.

216661152 is an abundant number, since it is smaller than the sum of its proper divisors (352074624).

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

216661152 is a wasteful number, since it uses less digits than its factorization.

216661152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2256900 (or 2256892 counting only the distinct ones).

The product of its digits is 4320, while the sum is 30.

The square root of 216661152 is about 14719.4141187752. The cubic root of 216661152 is about 600.6115542350.

The spelling of 216661152 in words is "two hundred sixteen million, six hundred sixty-one thousand, one hundred fifty-two".