216395656 has 8 divisors (see below), whose sum is σ = 405741870. Its totient is φ = 108197824.

The previous prime is 216395639. The next prime is 216395659. The reversal of 216395656 is 656593612.

It can be written as a sum of positive squares in only one way, i.e., 188622756 + 27772900 = 13734^2 + 5270^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (216395659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13524721 + ... + 13524736.

Almost surely, 2^216395656 is an apocalyptic number.

It is an amenable number.

216395656 is a deficient number, since it is larger than the sum of its proper divisors (189346214).

216395656 is a wasteful number, since it uses less digits than its factorization.

216395656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27049463 (or 27049459 counting only the distinct ones).

The product of its digits is 291600, while the sum is 43.

The square root of 216395656 is about 14710.3927887735. The cubic root of 216395656 is about 600.3661246906.

The spelling of 216395656 in words is "two hundred sixteen million, three hundred ninety-five thousand, six hundred fifty-six".