12781823675767 has 2 divisors, whose sum is σ = 12781823675768. Its totient is φ = 12781823675766.

The previous prime is 12781823675723. The next prime is 12781823675783. The reversal of 12781823675767 is 76757632818721.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (76757632818721) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12781823675767 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12781823675696 and 12781823675705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12781823670767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6390911837883 + 6390911837884.

It is an arithmetic number, because the mean of its divisors is an integer number (6390911837884).

Almost surely, 2^{12781823675767} is an apocalyptic number.

12781823675767 is a deficient number, since it is larger than the sum of its proper divisors (1).

12781823675767 is an equidigital number, since it uses as much as digits as its factorization.

12781823675767 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 331914240, while the sum is 70.

The spelling of 12781823675767 in words is "twelve trillion, seven hundred eighty-one billion, eight hundred twenty-three million, six hundred seventy-five thousand, seven hundred sixty-seven".