216636866 has 16 divisors (see below), whose sum is σ = 343623168. Its totient is φ = 102266400.

The previous prime is 216636863. The next prime is 216636869. The reversal of 216636866 is 668636612.

It is an interprime number because it is at equal distance from previous prime (216636863) and next prime (216636869).

It is not an unprimeable number, because it can be changed into a prime (216636863) 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, 40070 + ... + 45153.

It is an arithmetic number, because the mean of its divisors is an integer number (21476448).

Almost surely, 2^216636866 is an apocalyptic number.

216636866 is a deficient number, since it is larger than the sum of its proper divisors (126986302).

216636866 is a wasteful number, since it uses less digits than its factorization.

216636866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85297.

The product of its digits is 373248, while the sum is 44.

The square root of 216636866 is about 14718.5891307557. The cubic root of 216636866 is about 600.5891121296.

The spelling of 216636866 in words is "two hundred sixteen million, six hundred thirty-six thousand, eight hundred sixty-six".