55555555500 has 144 divisors (see below), whose sum is σ = 179996535264. Its totient is φ = 14414371200.

The previous prime is 55555555477. The next prime is 55555555543. The reversal of 55555555500 is 555555555.

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

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

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 47 ways as a sum of consecutive naturals, for example, 334 + ... + 333333.

Almost surely, 2^55555555500 is an apocalyptic number.

55555555500 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 practical number, because each smaller number is the sum of distinct divisors of 55555555500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89998267632).

55555555500 is an abundant number, since it is smaller than the sum of its proper divisors (124440979764).

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

55555555500 is a wasteful number, since it uses less digits than its factorization.

55555555500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333729 (or 333714 counting only the distinct ones).

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

Subtracting from 55555555500 its reverse (555555555), we obtain a palindrome (54999999945).

55555555500 divided by its reverse (555555555) gives a square (100 = 10²).

It can be divided in two parts, 55 and 555555500, that added together give a palindrome (555555555).

The spelling of 55555555500 in words is "fifty-five billion, five hundred fifty-five million, five hundred fifty-five thousand, five hundred".