12886638644 has 24 divisors (see below), whose sum is σ = 24689339136. Its totient is φ = 5836712000.

The previous prime is 12886638601. The next prime is 12886638649. The reversal of 12886638644 is 44683668821.

It is a self number, because there is not a number n which added to its sum of digits gives 12886638644.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12886638649) 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, 508772 + ... + 533499.

It is an arithmetic number, because the mean of its divisors is an integer number (1028722464).

Almost surely, 2^12886638644 is an apocalyptic number.

It is an amenable number.

12886638644 is a deficient number, since it is larger than the sum of its proper divisors (11802700492).

12886638644 is a wasteful number, since it uses less digits than its factorization.

12886638644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042567 (or 1042565 counting only the distinct ones).

The product of its digits is 10616832, while the sum is 56.

The spelling of 12886638644 in words is "twelve billion, eight hundred eighty-six million, six hundred thirty-eight thousand, six hundred forty-four".