12781600613 has 2 divisors, whose sum is σ = 12781600614. Its totient is φ = 12781600612.

The previous prime is 12781600597. The next prime is 12781600631. The reversal of 12781600613 is 31600618721.

Together with next prime (12781600631) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11934907009 + 846693604 = 109247^2 + 29098^2 .

It is a cyclic number.

It is not a de Polignac number, because 12781600613 - 2⁴ = 12781600597 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12781600673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6390800306 + 6390800307.

It is an arithmetic number, because the mean of its divisors is an integer number (6390800307).

Almost surely, 2^12781600613 is an apocalyptic number.

It is an amenable number.

12781600613 is a deficient number, since it is larger than the sum of its proper divisors (1).

12781600613 is an equidigital number, since it uses as much as digits as its factorization.

12781600613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 35.

The spelling of 12781600613 in words is "twelve billion, seven hundred eighty-one million, six hundred thousand, six hundred thirteen".