It is an unprimeable number.
Almost surely, 255055500550500 is an apocalyptic number.
55055500550500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.
It is an amenable number.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
55055500550500 is a wasteful number, since it uses less digits than its factorization.
55055500550500 is an evil number, because the sum of its binary digits is even.
The spelling of 55055500550500 in words is "fifty-five trillion, fifty-five billion, five hundred million, five hundred fifty thousand, five hundred".