12547244638 has 16 divisors (see below), whose sum is σ = 19941143760. Its totient is φ = 5900684416.

The previous prime is 12547244551. The next prime is 12547244639. The reversal of 12547244638 is 83644274521.

12547244638 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12547244639) 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, 69373 + ... + 172936.

It is an arithmetic number, because the mean of its divisors is an integer number (1246321485).

Almost surely, 2^12547244638 is an apocalyptic number.

12547244638 is a deficient number, since it is larger than the sum of its proper divisors (7393899122).

12547244638 is a wasteful number, since it uses less digits than its factorization.

12547244638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243851.

The product of its digits is 1290240, while the sum is 46.

The spelling of 12547244638 in words is "twelve billion, five hundred forty-seven million, two hundred forty-four thousand, six hundred thirty-eight".