216565612 has 12 divisors (see below), whose sum is σ = 379108296. Its totient is φ = 108248960.

The previous prime is 216565511. The next prime is 216565621.

216565612 is nontrivially palindromic in base 10.

216565612 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an alternating number because its digits alternate between even and odd.

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, 10812 + ... + 23452.

It is an arithmetic number, because the mean of its divisors is an integer number (31592358).

Almost surely, 2^216565612 is an apocalyptic number.

It is an amenable number.

216565612 is a deficient number, since it is larger than the sum of its proper divisors (162542684).

216565612 is a wasteful number, since it uses less digits than its factorization.

216565612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16928 (or 16926 counting only the distinct ones).

The product of its digits is 21600, while the sum is 34.

The square root of 216565612 is about 14716.1683871856. The cubic root of 216565612 is about 600.5232583500.

The spelling of 216565612 in words is "two hundred sixteen million, five hundred sixty-five thousand, six hundred twelve".