206668717 has 16 divisors (see below), whose sum is σ = 217085184. Its totient is φ = 196560000.

The previous prime is 206668699. The next prime is 206668727. The reversal of 206668717 is 717866602.

It is a cyclic number.

It is not a de Polignac number, because 206668717 - 2¹⁹ = 206144429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206668727) by changing a digit.

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, 396417 + ... + 396937.

It is an arithmetic number, because the mean of its divisors is an integer number (13567824).

Almost surely, 2^206668717 is an apocalyptic number.

It is an amenable number.

206668717 is a deficient number, since it is larger than the sum of its proper divisors (10416467).

206668717 is a wasteful number, since it uses less digits than its factorization.

206668717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780.

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 206668717 is about 14375.9770798370. The cubic root of 206668717 is about 591.2324300524.

The spelling of 206668717 in words is "two hundred six million, six hundred sixty-eight thousand, seven hundred seventeen".