12745769521 has 2 divisors, whose sum is σ = 12745769522. Its totient is φ = 12745769520.

The previous prime is 12745769513. The next prime is 12745769557. The reversal of 12745769521 is 12596754721.

It is a happy number.

12745769521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7649951296 + 5095818225 = 87464^2 + 71385^2 .

It is a cyclic number.

It is not a de Polignac number, because 12745769521 - 2³ = 12745769513 is a prime.

It is not a weakly prime, because it can be changed into another prime (12745769021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6372884760 + 6372884761.

It is an arithmetic number, because the mean of its divisors is an integer number (6372884761).

Almost surely, 2^12745769521 is an apocalyptic number.

It is an amenable number.

12745769521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12745769521 is an equidigital number, since it uses as much as digits as its factorization.

12745769521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1058400, while the sum is 49.

The spelling of 12745769521 in words is "twelve billion, seven hundred forty-five million, seven hundred sixty-nine thousand, five hundred twenty-one".