866540216 has 8 divisors (see below), whose sum is σ = 1624762920. Its totient is φ = 433270104.

The previous prime is 866540209. The next prime is 866540221. The reversal of 866540216 is 612045668.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 866540216.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54158756 + ... + 54158771.

It is an arithmetic number, because the mean of its divisors is an integer number (203095365).

Almost surely, 2^866540216 is an apocalyptic number.

It is an amenable number.

866540216 is a deficient number, since it is larger than the sum of its proper divisors (758222704).

866540216 is a wasteful number, since it uses less digits than its factorization.

866540216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108317533 (or 108317529 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 866540216 is about 29437.0551516282. The cubic root of 866540216 is about 953.3731303038.

The spelling of 866540216 in words is "eight hundred sixty-six million, five hundred forty thousand, two hundred sixteen".