205055617 has 8 divisors (see below), whose sum is σ = 220941056. Its totient is φ = 189186192.

The previous prime is 205055579. The next prime is 205055623. The reversal of 205055617 is 716550502.

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

It is not a de Polignac number, because 205055617 - 2⁷ = 205055489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205055677) 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, 43888 + ... + 48334.

It is an arithmetic number, because the mean of its divisors is an integer number (27617632).

Almost surely, 2^205055617 is an apocalyptic number.

It is an amenable number.

205055617 is a deficient number, since it is larger than the sum of its proper divisors (15885439).

205055617 is a wasteful number, since it uses less digits than its factorization.

205055617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8007.

The product of its (nonzero) digits is 10500, while the sum is 31.

The square root of 205055617 is about 14319.7631614493. The cubic root of 205055617 is about 589.6901724811.

The spelling of 205055617 in words is "two hundred five million, fifty-five thousand, six hundred seventeen".