216235666 has 16 divisors (see below), whose sum is σ = 330166656. Its totient is φ = 106189776.

The previous prime is 216235651. The next prime is 216235697. The reversal of 216235666 is 666532612.

216235666 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, 46980 + ... + 51376.

It is an arithmetic number, because the mean of its divisors is an integer number (20635416).

Almost surely, 2^216235666 is an apocalyptic number.

216235666 is a deficient number, since it is larger than the sum of its proper divisors (113930990).

216235666 is a wasteful number, since it uses less digits than its factorization.

216235666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4833.

The product of its digits is 77760, while the sum is 37.

The square root of 216235666 is about 14704.9537911549. The cubic root of 216235666 is about 600.2181299485.

The spelling of 216235666 in words is "two hundred sixteen million, two hundred thirty-five thousand, six hundred sixty-six".