206886666 has 32 divisors (see below), whose sum is σ = 481811328. Its totient is φ = 57994560.

The previous prime is 206886643. The next prime is 206886671. The reversal of 206886666 is 666688602.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44245 + ... + 48696.

It is an arithmetic number, because the mean of its divisors is an integer number (15056604).

Almost surely, 2^206886666 is an apocalyptic number.

206886666 is an abundant number, since it is smaller than the sum of its proper divisors (274924662).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

206886666 is a wasteful number, since it uses less digits than its factorization.

206886666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93006.

The product of its (nonzero) digits is 995328, while the sum is 48.

The square root of 206886666 is about 14383.5554019165. Note that the first 3 decimals coincide. The cubic root of 206886666 is about 591.4401912914.

The spelling of 206886666 in words is "two hundred six million, eight hundred eighty-six thousand, six hundred sixty-six".