12759783581 has 2 divisors, whose sum is σ = 12759783582. Its totient is φ = 12759783580.

The previous prime is 12759783571. The next prime is 12759783587. The reversal of 12759783581 is 18538795721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12550720900 + 209062681 = 112030^2 + 14459^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12759783581 is a prime.

It is a super-2 number, since 2×12759783581² (a number of 21 digits) contains 22 as substring.

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 (12759783587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6379891790 + 6379891791.

It is an arithmetic number, because the mean of its divisors is an integer number (6379891791).

Almost surely, 2^12759783581 is an apocalyptic number.

It is an amenable number.

12759783581 is a deficient number, since it is larger than the sum of its proper divisors (1).

12759783581 is an equidigital number, since it uses as much as digits as its factorization.

12759783581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4233600, while the sum is 56.

The spelling of 12759783581 in words is "twelve billion, seven hundred fifty-nine million, seven hundred eighty-three thousand, five hundred eighty-one".