12781730641 has 2 divisors, whose sum is σ = 12781730642. Its totient is φ = 12781730640.

The previous prime is 12781730617. The next prime is 12781730651. The reversal of 12781730641 is 14603718721.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9507030016 + 3274700625 = 97504^2 + 57225^2 .

It is a cyclic number.

It is not a de Polignac number, because 12781730641 - 2⁵ = 12781730609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12781730594 and 12781730603.

It is not a weakly prime, because it can be changed into another prime (12781730651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6390865320 + 6390865321.

It is an arithmetic number, because the mean of its divisors is an integer number (6390865321).

Almost surely, 2^12781730641 is an apocalyptic number.

It is an amenable number.

12781730641 is a deficient number, since it is larger than the sum of its proper divisors (1).

12781730641 is an equidigital number, since it uses as much as digits as its factorization.

12781730641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56448, while the sum is 40.

The spelling of 12781730641 in words is "twelve billion, seven hundred eighty-one million, seven hundred thirty thousand, six hundred forty-one".