12866813971243 has 2 divisors, whose sum is σ = 12866813971244. Its totient is φ = 12866813971242.

The previous prime is 12866813971199. The next prime is 12866813971301. The reversal of 12866813971243 is 34217931866821.

It is a weak prime.

It is an emirp because it is prime and its reverse (34217931866821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12866813971243 - 2¹³ = 12866813963051 is a prime.

It is not a weakly prime, because it can be changed into another prime (12866813971643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6433406985621 + 6433406985622.

It is an arithmetic number, because the mean of its divisors is an integer number (6433406985622).

Almost surely, 2^{12866813971243} is an apocalyptic number.

12866813971243 is a deficient number, since it is larger than the sum of its proper divisors (1).

12866813971243 is an equidigital number, since it uses as much as digits as its factorization.

12866813971243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20901888, while the sum is 61.

The spelling of 12866813971243 in words is "twelve trillion, eight hundred sixty-six billion, eight hundred thirteen million, nine hundred seventy-one thousand, two hundred forty-three".