206708666 has 8 divisors (see below), whose sum is σ = 310164660. Its totient is φ = 103320448.

The previous prime is 206708653. The next prime is 206708693. The reversal of 206708666 is 666807602.

It can be written as a sum of positive squares in 2 ways, for example, as 168454441 + 38254225 = 12979^2 + 6185^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 8471 + ... + 22026.

Almost surely, 2^206708666 is an apocalyptic number.

206708666 is a deficient number, since it is larger than the sum of its proper divisors (103455994).

206708666 is a wasteful number, since it uses less digits than its factorization.

206708666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33888.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 206708666 is about 14377.3664486929. The cubic root of 206708666 is about 591.2705226142.

The spelling of 206708666 in words is "two hundred six million, seven hundred eight thousand, six hundred sixty-six".