12638812501291 has 2 divisors, whose sum is σ = 12638812501292. Its totient is φ = 12638812501290.

The previous prime is 12638812501243. The next prime is 12638812501349. The reversal of 12638812501291 is 19210521883621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12638812501291 - 2²¹ = 12638810404139 is a prime.

It is not a weakly prime, because it can be changed into another prime (12638812502291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6319406250645 + 6319406250646.

It is an arithmetic number, because the mean of its divisors is an integer number (6319406250646).

Almost surely, 2^{12638812501291} is an apocalyptic number.

12638812501291 is a deficient number, since it is larger than the sum of its proper divisors (1).

12638812501291 is an equidigital number, since it uses as much as digits as its factorization.

12638812501291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 414720, while the sum is 49.

The spelling of 12638812501291 in words is "twelve trillion, six hundred thirty-eight billion, eight hundred twelve million, five hundred one thousand, two hundred ninety-one".