216626866 has 16 divisors (see below), whose sum is σ = 344547360. Its totient is φ = 101861280.

The previous prime is 216626797. The next prime is 216626881. The reversal of 216626866 is 668626612.

216626866 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15600 + ... + 26011.

It is an arithmetic number, because the mean of its divisors is an integer number (21534210).

Almost surely, 2^216626866 is an apocalyptic number.

216626866 is a deficient number, since it is larger than the sum of its proper divisors (127920494).

216626866 is a wasteful number, since it uses less digits than its factorization.

216626866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41769.

The product of its digits is 248832, while the sum is 43.

The square root of 216626866 is about 14718.2494203625. The cubic root of 216626866 is about 600.5798708839.

The spelling of 216626866 in words is "two hundred sixteen million, six hundred twenty-six thousand, eight hundred sixty-six".