12943566534991 has 2 divisors, whose sum is σ = 12943566534992. Its totient is φ = 12943566534990.

The previous prime is 12943566534989. The next prime is 12943566535033. The reversal of 12943566534991 is 19943566534921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12943566534991 - 2¹ = 12943566534989 is a prime.

Together with 12943566534989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12943566534191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6471783267495 + 6471783267496.

It is an arithmetic number, because the mean of its divisors is an integer number (6471783267496).

Almost surely, 2^{12943566534991} is an apocalyptic number.

12943566534991 is a deficient number, since it is larger than the sum of its proper divisors (1).

12943566534991 is an equidigital number, since it uses as much as digits as its factorization.

12943566534991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 188956800, while the sum is 67.

The spelling of 12943566534991 in words is "twelve trillion, nine hundred forty-three billion, five hundred sixty-six million, five hundred thirty-four thousand, nine hundred ninety-one".