55055555550 has 48 divisors (see below), whose sum is σ = 151708645680. Its totient is φ = 14681481120.

The previous prime is 55055555539. The next prime is 55055555563. The reversal of 55055555550 is 5555555055.

It is a super-2 number, since 2×55055555550² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 55055555496 and 55055555505.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20389597 + ... + 20392296.

It is an arithmetic number, because the mean of its divisors is an integer number (3160596785).

Almost surely, 2^55055555550 is an apocalyptic number.

55055555550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

55055555550 is an abundant number, since it is smaller than the sum of its proper divisors (96653090130).

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

55055555550 is a wasteful number, since it uses less digits than its factorization.

55055555550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40781914 (or 40781903 counting only the distinct ones).

The product of its (nonzero) digits is 1953125, while the sum is 45.

The spelling of 55055555550 in words is "fifty-five billion, fifty-five million, five hundred fifty-five thousand, five hundred fifty".