55555055550 has 48 divisors (see below), whose sum is σ = 153085045680. Its totient is φ = 14814681120.

The previous prime is 55555055539. The next prime is 55555055579. The reversal of 55555055550 is 5555055555.

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 = 55555055496 and 55555055505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20574597 + ... + 20577296.

It is an arithmetic number, because the mean of its divisors is an integer number (3189271785).

Almost surely, 2^55555055550 is an apocalyptic number.

55555055550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

55555055550 is an abundant number, since it is smaller than the sum of its proper divisors (97529990130).

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

55555055550 is a wasteful number, since it uses less digits than its factorization.

55555055550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41151914 (or 41151903 counting only the distinct ones).

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

The spelling of 55555055550 in words is "fifty-five billion, five hundred fifty-five million, fifty-five thousand, five hundred fifty".