216326600666 has 48 divisors (see below), whose sum is σ = 369136845000. Its totient is φ = 94896574080.

The previous prime is 216326600653. The next prime is 216326600687. The reversal of 216326600666 is 666006623612.

It can be written as a sum of positive squares in 4 ways, for example, as 85840210225 + 130486390441 = 292985^2 + 361229^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19286876 + ... + 19298088.

Almost surely, 2^216326600666 is an apocalyptic number.

216326600666 is a deficient number, since it is larger than the sum of its proper divisors (152810244334).

216326600666 is a wasteful number, since it uses less digits than its factorization.

216326600666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14015 (or 14004 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 44.

The spelling of 216326600666 in words is "two hundred sixteen billion, three hundred twenty-six million, six hundred thousand, six hundred sixty-six".