It is a happy number.
5555 is nontrivially palindromic in base 10.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a nude number because it is divisible by every one of its digits.
It is a Duffinian number.
5555 is a nontrivial repdigit in base 10.
It is a plaindrome in base 10.
It is a nialpdrome in base 9 and base 10.
It is a zygodrome in base 10.
It is an upside-down number.
25555 is an apocalyptic number.
5555 is a gapful number since it is divisible by the number (55) formed by its first and last digit.
5555 is a wasteful number, since it uses less digits than its factorization.
5555 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 117.
The square root of 5555 is about 74.5318723769. The cubic root of 5555 is about 17.7103857675.
The spelling of 5555 in words is "five thousand, five hundred fifty-five".