12775377891649 has 2 divisors, whose sum is σ = 12775377891650. Its totient is φ = 12775377891648.

The previous prime is 12775377891641. The next prime is 12775377891659. The reversal of 12775377891649 is 94619877357721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9354006298624 + 3421371593025 = 3058432^2 + 1849695^2 .

It is an emirp because it is prime and its reverse (94619877357721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12775377891649 - 2³ = 12775377891641 is a prime.

It is not a weakly prime, because it can be changed into another prime (12775377891641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6387688945824 + 6387688945825.

It is an arithmetic number, because the mean of its divisors is an integer number (6387688945825).

Almost surely, 2^{12775377891649} is an apocalyptic number.

It is an amenable number.

12775377891649 is a deficient number, since it is larger than the sum of its proper divisors (1).

12775377891649 is an equidigital number, since it uses as much as digits as its factorization.

12775377891649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1120210560, while the sum is 76.

The spelling of 12775377891649 in words is "twelve trillion, seven hundred seventy-five billion, three hundred seventy-seven million, eight hundred ninety-one thousand, six hundred forty-nine".