866699216 has 20 divisors (see below), whose sum is σ = 1702235172. Its totient is φ = 427412736.

The previous prime is 866699173. The next prime is 866699227. The reversal of 866699216 is 612996668.

866699216 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 246490000 + 620209216 = 15700^2 + 24904^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 369851 + ... + 372186.

Almost surely, 2^866699216 is an apocalyptic number.

It is an amenable number.

866699216 is a deficient number, since it is larger than the sum of its proper divisors (835535956).

866699216 is a wasteful number, since it uses less digits than its factorization.

866699216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742118 (or 742112 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 53.

The square root of 866699216 is about 29439.7557055082. The cubic root of 866699216 is about 953.4314376793.

The spelling of 866699216 in words is "eight hundred sixty-six million, six hundred ninety-nine thousand, two hundred sixteen".