216556516 has 24 divisors (see below), whose sum is σ = 421231104. Its totient is φ = 96576480.

The previous prime is 216556469. The next prime is 216556517. The reversal of 216556516 is 615655612.

216556516 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (216556517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44100 + ... + 48763.

It is an arithmetic number, because the mean of its divisors is an integer number (17551296).

Almost surely, 2^216556516 is an apocalyptic number.

It is an amenable number.

216556516 is a deficient number, since it is larger than the sum of its proper divisors (204674588).

216556516 is a wasteful number, since it uses less digits than its factorization.

216556516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92931 (or 92929 counting only the distinct ones).

The product of its digits is 54000, while the sum is 37.

The square root of 216556516 is about 14715.8593361040. The cubic root of 216556516 is about 600.5148506809.

The spelling of 216556516 in words is "two hundred sixteen million, five hundred fifty-six thousand, five hundred sixteen".