12516563243 has 2 divisors, whose sum is σ = 12516563244. Its totient is φ = 12516563242.

The previous prime is 12516563239. The next prime is 12516563287. The reversal of 12516563243 is 34236561521.

12516563243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (34236561521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12516563243 - 2² = 12516563239 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12516563197 and 12516563206.

It is not a weakly prime, because it can be changed into another prime (12516563203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6258281621 + 6258281622.

It is an arithmetic number, because the mean of its divisors is an integer number (6258281622).

Almost surely, 2^12516563243 is an apocalyptic number.

12516563243 is a deficient number, since it is larger than the sum of its proper divisors (1).

12516563243 is an equidigital number, since it uses as much as digits as its factorization.

12516563243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129600, while the sum is 38.

The spelling of 12516563243 in words is "twelve billion, five hundred sixteen million, five hundred sixty-three thousand, two hundred forty-three".