505555005550 has 96 divisors (see below), whose sum is σ = 1091208729600. Its totient is φ = 170676754560.

The previous prime is 505555005547. The next prime is 505555005559. The reversal of 505555005550 is 55500555505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505555005559) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10288941 + ... + 10337959.

It is an arithmetic number, because the mean of its divisors is an integer number (11366757600).

Almost surely, 2^505555005550 is an apocalyptic number.

505555005550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

505555005550 is an abundant number, since it is smaller than the sum of its proper divisors (585653724050).

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

505555005550 is a wasteful number, since it uses less digits than its factorization.

505555005550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49490 (or 49485 counting only the distinct ones).

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

The spelling of 505555005550 in words is "five hundred five billion, five hundred fifty-five million, five thousand, five hundred fifty".