12538565504 has 16 divisors (see below), whose sum is σ = 24979173720. Its totient is φ = 6269282688.

The previous prime is 12538565503. The next prime is 12538565537. The reversal of 12538565504 is 40556583521.

It is a happy number.

12538565504 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12538565503) by changing a digit.

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 as a sum of consecutive naturals, namely, 48978644 + ... + 48978899.

Almost surely, 2^12538565504 is an apocalyptic number.

It is an amenable number.

12538565504 is a deficient number, since it is larger than the sum of its proper divisors (12440608216).

12538565504 is an frugal number, since it uses more digits than its factorization.

12538565504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97957557 (or 97957545 counting only the distinct ones).

The product of its (nonzero) digits is 720000, while the sum is 44.

The spelling of 12538565504 in words is "twelve billion, five hundred thirty-eight million, five hundred sixty-five thousand, five hundred four".