205555 has 12 divisors (see below), whose sum is σ = 287280. Its totient is φ = 140784.

The previous prime is 205553. The next prime is 205559. The reversal of 205555 is 555502.

205555 = T₆₆ + T₆₇ + ... + T₁₁₄.

It is not a de Polignac number, because 205555 - 2¹ = 205553 is a prime.

205555 is a modest number, since divided by 555 gives 205 as remainder.

It is not an unprimeable number, because it can be changed into a prime (205553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 175 + ... + 664.

It is an arithmetic number, because the mean of its divisors is an integer number (23940).

2²⁰⁵⁵⁵⁵ is an apocalyptic number.

205555 is a deficient number, since it is larger than the sum of its proper divisors (81725).

205555 is an equidigital number, since it uses as much as digits as its factorization.

205555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858 (or 851 counting only the distinct ones).

The product of its (nonzero) digits is 1250, while the sum is 22.

The square root of 205555 is about 453.3817376119. The cubic root of 205555 is about 59.0168485827.

The spelling of 205555 in words is "two hundred five thousand, five hundred fifty-five".