12766650991 has 2 divisors, whose sum is σ = 12766650992. Its totient is φ = 12766650990.

The previous prime is 12766650989. The next prime is 12766651039. The reversal of 12766650991 is 19905666721.

It is a weak prime.

It is an emirp because it is prime and its reverse (19905666721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12766650991 - 2¹ = 12766650989 is a prime.

Together with 12766650989, 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 (12766650691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6383325495 + 6383325496.

It is an arithmetic number, because the mean of its divisors is an integer number (6383325496).

Almost surely, 2^12766650991 is an apocalyptic number.

12766650991 is a deficient number, since it is larger than the sum of its proper divisors (1).

12766650991 is an equidigital number, since it uses as much as digits as its factorization.

12766650991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1224720, while the sum is 52.

The spelling of 12766650991 in words is "twelve billion, seven hundred sixty-six million, six hundred fifty thousand, nine hundred ninety-one".