12555522420 has 96 divisors (see below), whose sum is σ = 40194475776. Its totient is φ = 2868633600.

The previous prime is 12555522409. The next prime is 12555522433. The reversal of 12555522420 is 2422555521.

It is a happy number.

12555522420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×12555522420² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1348180 + ... + 1357460.

It is an arithmetic number, because the mean of its divisors is an integer number (418692456).

Almost surely, 2^12555522420 is an apocalyptic number.

12555522420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12555522420 is an abundant number, since it is smaller than the sum of its proper divisors (27638953356).

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

12555522420 is a wasteful number, since it uses less digits than its factorization.

12555522420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12521 (or 12519 counting only the distinct ones).

The product of its (nonzero) digits is 40000, while the sum is 33.

The spelling of 12555522420 in words is "twelve billion, five hundred fifty-five million, five hundred twenty-two thousand, four hundred twenty".