555555 has 64 divisors (see below), whose sum is σ = 1225728. Its totient is φ = 207360.

The previous prime is 555523. The next prime is 555557.

555555 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 555555 - 2⁵ = 555523 is a prime.

It is a nude number because it is divisible by every one of its digits.

555555 is a modest number, since divided by 5555 gives 55 as remainder.

555555 is a nontrivial repdigit in base 10.

It is a plaindrome in base 10.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (555557) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14997 + ... + 15033.

It is an arithmetic number, because the mean of its divisors is an integer number (19152).

2⁵⁵⁵⁵⁵⁵ is an apocalyptic number.

555555 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

555555 is an abundant number, since it is smaller than the sum of its proper divisors (670173).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

555555 is a wasteful number, since it uses less digits than its factorization.

555555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76.

The product of its digits is 15625, while the sum is 30.

The square root of 555555 is about 745.3556198218. The cubic root of 555555 is about 82.2070417420.

The spelling of 555555 in words is "five hundred fifty-five thousand, five hundred fifty-five".