80243845065281 has 2 divisors, whose sum is σ = 80243845065282. Its totient is φ = 80243845065280.

The previous prime is 80243845065113. The next prime is 80243845065353. The reversal of 80243845065281 is 18256054834208.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67426843618225 + 12817001447056 = 8211385^2 + 3580084^2 .

It is a cyclic number.

It is not a de Polignac number, because 80243845065281 - 2³⁸ = 79968967158337 is a prime.

It is a super-2 number, since 2×80243845065281² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (80243845065581) 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, 40121922532640 + 40121922532641.

It is an arithmetic number, because the mean of its divisors is an integer number (40121922532641).

Almost surely, 2^{80243845065281} is an apocalyptic number.

It is an amenable number.

80243845065281 is a deficient number, since it is larger than the sum of its proper divisors (1).

80243845065281 is an equidigital number, since it uses as much as digits as its factorization.

80243845065281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14745600, while the sum is 56.

Adding to 80243845065281 its reverse (18256054834208), we get a palindrome (98499899899489).

The spelling of 80243845065281 in words is "eighty trillion, two hundred forty-three billion, eight hundred forty-five million, sixty-five thousand, two hundred eighty-one".