216536866 has 16 divisors (see below), whose sum is σ = 399760704. Its totient is φ = 85662864.

The previous prime is 216536819. The next prime is 216536897. The reversal of 216536866 is 668635612.

216536866 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, 594700 + ... + 595063.

It is an arithmetic number, because the mean of its divisors is an integer number (24985044).

Almost surely, 2^216536866 is an apocalyptic number.

216536866 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

216536866 is a deficient number, since it is larger than the sum of its proper divisors (183223838).

216536866 is a wasteful number, since it uses less digits than its factorization.

216536866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1189785.

The product of its digits is 311040, while the sum is 43.

The square root of 216536866 is about 14715.1916739131. The cubic root of 216536866 is about 600.4966868716.

The spelling of 216536866 in words is "two hundred sixteen million, five hundred thirty-six thousand, eight hundred sixty-six".