12886638637 has 4 divisors (see below), whose sum is σ = 12907661500. Its totient is φ = 12865615776.

The previous prime is 12886638601. The next prime is 12886638649. The reversal of 12886638637 is 73683668821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 185123236 + 12701515401 = 13606^2 + 112701^2 .

It is a cyclic number.

It is not a de Polignac number, because 12886638637 - 2¹⁵ = 12886605869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12886638437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10510512 + ... + 10511737.

It is an arithmetic number, because the mean of its divisors is an integer number (3226915375).

Almost surely, 2^12886638637 is an apocalyptic number.

It is an amenable number.

12886638637 is a deficient number, since it is larger than the sum of its proper divisors (21022863).

12886638637 is an equidigital number, since it uses as much as digits as its factorization.

12886638637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21022862.

The product of its digits is 13934592, while the sum is 58.

The spelling of 12886638637 in words is "twelve billion, eight hundred eighty-six million, six hundred thirty-eight thousand, six hundred thirty-seven".