205668013 has 8 divisors (see below), whose sum is σ = 210885696. Its totient is φ = 200460000.

The previous prime is 205668007. The next prime is 205668049. The reversal of 205668013 is 310866502.

205668013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 205668013 - 2¹³ = 205659821 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 (205668313) 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, 61638 + ... + 64888.

It is an arithmetic number, because the mean of its divisors is an integer number (26360712).

Almost surely, 2^205668013 is an apocalyptic number.

It is an amenable number.

205668013 is a deficient number, since it is larger than the sum of its proper divisors (5217683).

205668013 is a wasteful number, since it uses less digits than its factorization.

205668013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4835.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 205668013 is about 14341.1301158591. The cubic root of 205668013 is about 590.2766231330.

The spelling of 205668013 in words is "two hundred five million, six hundred sixty-eight thousand, thirteen".