12680745449 has 2 divisors, whose sum is σ = 12680745450. Its totient is φ = 12680745448.

The previous prime is 12680745439. The next prime is 12680745491. The reversal of 12680745449 is 94454708621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7791239824 + 4889505625 = 88268^2 + 69925^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12680745449 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12680745397 and 12680745406.

It is not a weakly prime, because it can be changed into another prime (12680745439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6340372724 + 6340372725.

It is an arithmetic number, because the mean of its divisors is an integer number (6340372725).

Almost surely, 2^12680745449 is an apocalyptic number.

It is an amenable number.

12680745449 is a deficient number, since it is larger than the sum of its proper divisors (1).

12680745449 is an equidigital number, since it uses as much as digits as its factorization.

12680745449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1935360, while the sum is 50.

The spelling of 12680745449 in words is "twelve billion, six hundred eighty million, seven hundred forty-five thousand, four hundred forty-nine".