216316664 has 16 divisors (see below), whose sum is σ = 405940200. Its totient is φ = 108065952.

The previous prime is 216316651. The next prime is 216316673. The reversal of 216316664 is 466613612.

It is a congruent 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, 1034 + ... + 20825.

Almost surely, 2^216316664 is an apocalyptic number.

It is an amenable number.

216316664 is a deficient number, since it is larger than the sum of its proper divisors (189623536).

216316664 is a wasteful number, since it uses less digits than its factorization.

216316664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23102 (or 23098 counting only the distinct ones).

The product of its digits is 31104, while the sum is 35.

The square root of 216316664 is about 14707.7076391938. The cubic root of 216316664 is about 600.2930642397.

The spelling of 216316664 in words is "two hundred sixteen million, three hundred sixteen thousand, six hundred sixty-four".