12666734441 has 2 divisors, whose sum is σ = 12666734442. Its totient is φ = 12666734440.

The previous prime is 12666734429. The next prime is 12666734449. The reversal of 12666734441 is 14443766621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11074405225 + 1592329216 = 105235^2 + 39904^2 .

It is an emirp because it is prime and its reverse (14443766621) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12666734441 is a prime.

It is a super-2 number, since 2×12666734441² (a number of 21 digits) contains 22 as substring.

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 = 12666734392 and 12666734401.

It is not a weakly prime, because it can be changed into another prime (12666734449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6333367220 + 6333367221.

It is an arithmetic number, because the mean of its divisors is an integer number (6333367221).

Almost surely, 2^12666734441 is an apocalyptic number.

It is an amenable number.

12666734441 is a deficient number, since it is larger than the sum of its proper divisors (1).

12666734441 is an equidigital number, since it uses as much as digits as its factorization.

12666734441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 44.

The spelling of 12666734441 in words is "twelve billion, six hundred sixty-six million, seven hundred thirty-four thousand, four hundred forty-one".