12187557424 has 80 divisors (see below), whose sum is σ = 27653452288. Its totient is φ = 5094544896.

The previous prime is 12187557419. The next prime is 12187557439. The reversal of 12187557424 is 42475578121.

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 15 ways as a sum of consecutive naturals, for example, 4655764 + ... + 4658380.

Almost surely, 2^12187557424 is an apocalyptic number.

12187557424 is a gapful number since it is divisible by the number (14) 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 12187557424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13826726144).

12187557424 is an abundant number, since it is smaller than the sum of its proper divisors (15465894864).

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

12187557424 is a wasteful number, since it uses less digits than its factorization.

12187557424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3642 (or 3636 counting only the distinct ones).

The product of its digits is 627200, while the sum is 46.

The spelling of 12187557424 in words is "twelve billion, one hundred eighty-seven million, five hundred fifty-seven thousand, four hundred twenty-four".