55005555005550 has 72 divisors (see below), whose sum is σ = 147976812098856. Its totient is φ = 14648771229120.

The previous prime is 55005555005539. The next prime is 55005555005567. The reversal of 55005555005550 is 5550055550055.

It is a super-2 number, since 2×55005555005550² (a number of 28 digits) contains 22 as substring.

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 = 55005555005496 and 55005555005505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 80395524 + ... + 81076823.

It is an arithmetic number, because the mean of its divisors is an integer number (2055233501373).

Almost surely, 2^{55005555005550} is an apocalyptic number.

55005555005550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

55005555005550 is an abundant number, since it is smaller than the sum of its proper divisors (92971257093306).

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

55005555005550 is a wasteful number, since it uses less digits than its factorization.

55005555005550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161473122 (or 161473114 counting only the distinct ones).

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

It can be divided in two parts, 55005 and 555005550, that added together give a palindrome (555060555).

The spelling of 55005555005550 in words is "fifty-five trillion, five billion, five hundred fifty-five million, five thousand, five hundred fifty".