12781730713 has 2 divisors, whose sum is σ = 12781730714. Its totient is φ = 12781730712.

The previous prime is 12781730671. The next prime is 12781730737. The reversal of 12781730713 is 31703718721.

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., 10926102784 + 1855627929 = 104528^2 + 43077^2 .

It is a cyclic number.

It is not a de Polignac number, because 12781730713 - 2⁹ = 12781730201 is a prime.

It is not a weakly prime, because it can be changed into another prime (12781730783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6390865356 + 6390865357.

It is an arithmetic number, because the mean of its divisors is an integer number (6390865357).

Almost surely, 2^12781730713 is an apocalyptic number.

It is an amenable number.

12781730713 is a deficient number, since it is larger than the sum of its proper divisors (1).

12781730713 is an equidigital number, since it uses as much as digits as its factorization.

12781730713 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 49392, while the sum is 40.

The spelling of 12781730713 in words is "twelve billion, seven hundred eighty-one million, seven hundred thirty thousand, seven hundred thirteen".