12638861539 has 2 divisors, whose sum is σ = 12638861540. Its totient is φ = 12638861538.

The previous prime is 12638861513. The next prime is 12638861563. The reversal of 12638861539 is 93516883621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12638861539 - 2¹⁵ = 12638828771 is a prime.

It is not a weakly prime, because it can be changed into another prime (12638861239) by changing a digit.

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 as a sum of consecutive naturals, namely, 6319430769 + 6319430770.

It is an arithmetic number, because the mean of its divisors is an integer number (6319430770).

Almost surely, 2^12638861539 is an apocalyptic number.

12638861539 is a deficient number, since it is larger than the sum of its proper divisors (1).

12638861539 is an equidigital number, since it uses as much as digits as its factorization.

12638861539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1866240, while the sum is 52.

The spelling of 12638861539 in words is "twelve billion, six hundred thirty-eight million, eight hundred sixty-one thousand, five hundred thirty-nine".