255555 has 20 divisors (see below), whose sum is σ = 458832. Its totient is φ = 136080.

The previous prime is 255551. The next prime is 255571. The reversal of 255555 is 555552.

It is a happy number.

It is not a de Polignac number, because 255555 - 2² = 255551 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

255555 is a modest number, since divided by 555 gives 255 as remainder.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (255551) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 90 + ... + 720.

2²⁵⁵⁵⁵⁵ is an apocalyptic number.

255555 is a deficient number, since it is larger than the sum of its proper divisors (203277).

255555 is an equidigital number, since it uses as much as digits as its factorization.

255555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648 (or 639 counting only the distinct ones).

The product of its digits is 6250, while the sum is 27.

The square root of 255555 is about 505.5244801194. The cubic root of 255555 is about 63.4592294138.

The spelling of 255555 in words is "two hundred fifty-five thousand, five hundred fifty-five".