12638798737 has 2 divisors, whose sum is σ = 12638798738. Its totient is φ = 12638798736.

The previous prime is 12638798719. The next prime is 12638798743. The reversal of 12638798737 is 73789783621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8664631056 + 3974167681 = 93084^2 + 63041^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12638798737 is a prime.

It is not a weakly prime, because it can be changed into another prime (12638792737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6319399368 + 6319399369.

It is an arithmetic number, because the mean of its divisors is an integer number (6319399369).

Almost surely, 2^12638798737 is an apocalyptic number.

It is an amenable number.

12638798737 is a deficient number, since it is larger than the sum of its proper divisors (1).

12638798737 is an equidigital number, since it uses as much as digits as its factorization.

12638798737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21337344, while the sum is 61.

The spelling of 12638798737 in words is "twelve billion, six hundred thirty-eight million, seven hundred ninety-eight thousand, seven hundred thirty-seven".