12555501220 has 24 divisors (see below), whose sum is σ = 26456553144. Its totient is φ = 5005057536.

The previous prime is 12555501209. The next prime is 12555501221. The reversal of 12555501220 is 2210555521.

It can be written as a sum of positive squares in 4 ways, for example, as 5163284736 + 7392216484 = 71856^2 + 85978^2 .

It is a super-3 number, since 3×12555501220³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (12555501221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1065429 + ... + 1077148.

It is an arithmetic number, because the mean of its divisors is an integer number (1102356381).

Almost surely, 2^12555501220 is an apocalyptic number.

12555501220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12555501220 is an abundant number, since it is smaller than the sum of its proper divisors (13901051924).

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

12555501220 is a wasteful number, since it uses less digits than its factorization.

12555501220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2142879 (or 2142877 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 28.

The spelling of 12555501220 in words is "twelve billion, five hundred fifty-five million, five hundred one thousand, two hundred twenty".