205668717 has 8 divisors (see below), whose sum is σ = 274480224. Its totient is φ = 136984848.

The previous prime is 205668643. The next prime is 205668719. The reversal of 205668717 is 717866502.

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

It is not a de Polignac number, because 205668717 - 2¹⁵ = 205635949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205668719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28083 + ... + 34640.

It is an arithmetic number, because the mean of its divisors is an integer number (34310028).

Almost surely, 2^205668717 is an apocalyptic number.

It is an amenable number.

205668717 is a deficient number, since it is larger than the sum of its proper divisors (68811507).

205668717 is a wasteful number, since it uses less digits than its factorization.

205668717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63819.

The product of its (nonzero) digits is 141120, while the sum is 42.

The square root of 205668717 is about 14341.1546606262. The cubic root of 205668717 is about 590.2772966363.

The spelling of 205668717 in words is "two hundred five million, six hundred sixty-eight thousand, seven hundred seventeen".