12868087681 has 2 divisors, whose sum is σ = 12868087682. Its totient is φ = 12868087680.

The previous prime is 12868087663. The next prime is 12868087691. The reversal of 12868087681 is 18678086821.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10603850625 + 2264237056 = 102975^2 + 47584^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12868087681 is a prime.

It is a super-2 number, since 2×12868087681² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12868087601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6434043840 + 6434043841.

It is an arithmetic number, because the mean of its divisors is an integer number (6434043841).

Almost surely, 2^12868087681 is an apocalyptic number.

It is an amenable number.

12868087681 is a deficient number, since it is larger than the sum of its proper divisors (1).

12868087681 is an equidigital number, since it uses as much as digits as its factorization.

12868087681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2064384, while the sum is 55.

The spelling of 12868087681 in words is "twelve billion, eight hundred sixty-eight million, eighty-seven thousand, six hundred eighty-one".