12638580397 has 2 divisors, whose sum is σ = 12638580398. Its totient is φ = 12638580396.

The previous prime is 12638580377. The next prime is 12638580481. The reversal of 12638580397 is 79308583621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11484551556 + 1154028841 = 107166^2 + 33971^2 .

It is a cyclic number.

It is not a de Polignac number, because 12638580397 - 2²³ = 12630191789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12638580377) 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, 6319290198 + 6319290199.

It is an arithmetic number, because the mean of its divisors is an integer number (6319290199).

Almost surely, 2^12638580397 is an apocalyptic number.

It is an amenable number.

12638580397 is a deficient number, since it is larger than the sum of its proper divisors (1).

12638580397 is an equidigital number, since it uses as much as digits as its factorization.

12638580397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2177280, while the sum is 52.

The spelling of 12638580397 in words is "twelve billion, six hundred thirty-eight million, five hundred eighty thousand, three hundred ninety-seven".