12718821645841 has 2 divisors, whose sum is σ = 12718821645842. Its totient is φ = 12718821645840.

The previous prime is 12718821645823. The next prime is 12718821645853. The reversal of 12718821645841 is 14854612881721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12090947657616 + 627873988225 = 3477204^2 + 792385^2 .

It is an emirp because it is prime and its reverse (14854612881721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12718821645841 - 2⁴³ = 3922728623633 is a prime.

It is not a weakly prime, because it can be changed into another prime (12718221645841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6359410822920 + 6359410822921.

It is an arithmetic number, because the mean of its divisors is an integer number (6359410822921).

Almost surely, 2^{12718821645841} is an apocalyptic number.

It is an amenable number.

12718821645841 is a deficient number, since it is larger than the sum of its proper divisors (1).

12718821645841 is an equidigital number, since it uses as much as digits as its factorization.

12718821645841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6881280, while the sum is 58.

The spelling of 12718821645841 in words is "twelve trillion, seven hundred eighteen billion, eight hundred twenty-one million, six hundred forty-five thousand, eight hundred forty-one".