55550555550 has 144 divisors (see below), whose sum is σ = 179544044160. Its totient is φ = 12028979520.

The previous prime is 55550555503. The next prime is 55550555551. The reversal of 55550555550 is 5555505555.

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

It is a junction number, because it is equal to n+sod(n) for n = 55550555496 and 55550555505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55550555551) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 404232 + ... + 523931.

It is an arithmetic number, because the mean of its divisors is an integer number (1246833640).

Almost surely, 2^55550555550 is an apocalyptic number.

55550555550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

55550555550 is an abundant number, since it is smaller than the sum of its proper divisors (123993488610).

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

55550555550 is a wasteful number, since it uses less digits than its factorization.

55550555550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 928207 (or 928199 counting only the distinct ones).

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

The spelling of 55550555550 in words is "fifty-five billion, five hundred fifty million, five hundred fifty-five thousand, five hundred fifty".