216566512 has 20 divisors (see below), whose sum is σ = 425862376. Its totient is φ = 106666560.

The previous prime is 216566507. The next prime is 216566557. The reversal of 216566512 is 215665612.

It is a super-2 number, since 2×216566512² = 93802108239692288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99939 + ... + 102082.

Almost surely, 2^216566512 is an apocalyptic number.

It is an amenable number.

216566512 is a deficient number, since it is larger than the sum of its proper divisors (209295864).

216566512 is a wasteful number, since it uses less digits than its factorization.

216566512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202096 (or 202090 counting only the distinct ones).

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

The square root of 216566512 is about 14716.1989657656. The cubic root of 216566512 is about 600.5240902306.

The spelling of 216566512 in words is "two hundred sixteen million, five hundred sixty-six thousand, five hundred twelve".