205668217 has 8 divisors (see below), whose sum is σ = 217468160. Its totient is φ = 193965840.

The previous prime is 205668209. The next prime is 205668223. The reversal of 205668217 is 712866502.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 205668217 - 2³ = 205668209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205668247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20034 + ... + 28507.

It is an arithmetic number, because the mean of its divisors is an integer number (27183520).

Almost surely, 2^205668217 is an apocalyptic number.

It is an amenable number.

205668217 is a deficient number, since it is larger than the sum of its proper divisors (11799943).

205668217 is a wasteful number, since it uses less digits than its factorization.

205668217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48783.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 205668217 is about 14341.1372282675. The cubic root of 205668217 is about 590.2768182961.

The spelling of 205668217 in words is "two hundred five million, six hundred sixty-eight thousand, two hundred seventeen".