12555543438 has 48 divisors (see below), whose sum is σ = 27787608576. Its totient is φ = 4095748800.

The previous prime is 12555543419. The next prime is 12555543487. The reversal of 12555543438 is 83434555521.

It is a happy number.

12555543438 is a `hidden beast` number, since 1 + 2 + 55 + 554 + 3 + 43 + 8 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 12555543393 and 12555543402.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 362163 + ... + 395313.

It is an arithmetic number, because the mean of its divisors is an integer number (578908512).

Almost surely, 2^12555543438 is an apocalyptic number.

12555543438 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12555543438 is an abundant number, since it is smaller than the sum of its proper divisors (15232065138).

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

12555543438 is a wasteful number, since it uses less digits than its factorization.

12555543438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33609 (or 33606 counting only the distinct ones).

The product of its digits is 1440000, while the sum is 45.

The spelling of 12555543438 in words is "twelve billion, five hundred fifty-five million, five hundred forty-three thousand, four hundred thirty-eight".