55505555500 has 48 divisors (see below), whose sum is σ = 121590731808. Its totient is φ = 22135080000.

The previous prime is 55505555491. The next prime is 55505555507. The reversal of 55505555500 is 555550555.

It is not an unprimeable number, because it can be changed into a prime (55505555507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2191 + ... + 333190.

It is an arithmetic number, because the mean of its divisors is an integer number (2533140246).

Almost surely, 2^55505555500 is an apocalyptic number.

55505555500 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 55505555500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60795365904).

55505555500 is an abundant number, since it is smaller than the sum of its proper divisors (66085176308).

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

55505555500 is a wasteful number, since it uses less digits than its factorization.

55505555500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335731 (or 335719 counting only the distinct ones).

The product of its (nonzero) digits is 390625, while the sum is 40.

The spelling of 55505555500 in words is "fifty-five billion, five hundred five million, five hundred fifty-five thousand, five hundred".