205833661 has 8 divisors (see below), whose sum is σ = 224882784. Its totient is φ = 186840720.

The previous prime is 205833643. The next prime is 205833737. The reversal of 205833661 is 166338502.

205833661 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 not a de Polignac number, because 205833661 - 2⁷ = 205833533 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 (205833611) 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, 6186 + ... + 21211.

It is an arithmetic number, because the mean of its divisors is an integer number (28110348).

Almost surely, 2^205833661 is an apocalyptic number.

It is an amenable number.

205833661 is a deficient number, since it is larger than the sum of its proper divisors (19049123).

205833661 is a wasteful number, since it uses less digits than its factorization.

205833661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28091.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 205833661 is about 14346.9042305300. The cubic root of 205833661 is about 590.4350530573.

The spelling of 205833661 in words is "two hundred five million, eight hundred thirty-three thousand, six hundred sixty-one".