12638712397 has 2 divisors, whose sum is σ = 12638712398. Its totient is φ = 12638712396.

The previous prime is 12638712389. The next prime is 12638712403. The reversal of 12638712397 is 79321783621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9400078116 + 3238634281 = 96954^2 + 56909^2 .

It is a cyclic number.

It is not a de Polignac number, because 12638712397 - 2³ = 12638712389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12638712397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12638712337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6319356198 + 6319356199.

It is an arithmetic number, because the mean of its divisors is an integer number (6319356199).

Almost surely, 2^12638712397 is an apocalyptic number.

It is an amenable number.

12638712397 is a deficient number, since it is larger than the sum of its proper divisors (1).

12638712397 is an equidigital number, since it uses as much as digits as its factorization.

12638712397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 762048, while the sum is 49.

The spelling of 12638712397 in words is "twelve billion, six hundred thirty-eight million, seven hundred twelve thousand, three hundred ninety-seven".