12805454690789 has 2 divisors, whose sum is σ = 12805454690790. Its totient is φ = 12805454690788.

The previous prime is 12805454690767. The next prime is 12805454690813. The reversal of 12805454690789 is 98709645450821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12404977084900 + 400477605889 = 3522070^2 + 632833^2 .

It is a cyclic number.

It is not a de Polignac number, because 12805454690789 - 2³⁶ = 12736735214053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12805454690729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6402727345394 + 6402727345395.

It is an arithmetic number, because the mean of its divisors is an integer number (6402727345395).

Almost surely, 2^{12805454690789} is an apocalyptic number.

It is an amenable number.

12805454690789 is a deficient number, since it is larger than the sum of its proper divisors (1).

12805454690789 is an equidigital number, since it uses as much as digits as its factorization.

12805454690789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 174182400, while the sum is 68.

The spelling of 12805454690789 in words is "twelve trillion, eight hundred five billion, four hundred fifty-four million, six hundred ninety thousand, seven hundred eighty-nine".