505555000000 has 112 divisors (see below), whose sum is σ = 1254022570944. Its totient is φ = 202220000000.

The previous prime is 505554999997. The next prime is 505555000033. The reversal of 505555000000 is 555505.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4949445 + ... + 5050555.

Almost surely, 2^505555000000 is an apocalyptic number.

505555000000 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 505555000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (627011285472).

505555000000 is an abundant number, since it is smaller than the sum of its proper divisors (748467570944).

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

505555000000 is an frugal number, since it uses more digits than its factorization.

505555000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101158 (or 101118 counting only the distinct ones).

The product of its (nonzero) digits is 3125, while the sum is 25.

Adding to 505555000000 its reverse (555505), we get a palindrome (505555555505).

The spelling of 505555000000 in words is "five hundred five billion, five hundred fifty-five million", and thus it is an aban number.