8668684868681 has 2 divisors, whose sum is σ = 8668684868682. Its totient is φ = 8668684868680.

The previous prime is 8668684868651. The next prime is 8668684868813. The reversal of 8668684868681 is 1868684868668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8577430125625 + 91254743056 = 2928725^2 + 302084^2 .

It is a cyclic number.

It is not a de Polignac number, because 8668684868681 - 2⁶ = 8668684868617 is a prime.

It is a super-2 number, since 2×8668684868681² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8668684868681.

It is not a weakly prime, because it can be changed into another prime (8668684868651) 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, 4334342434340 + 4334342434341.

It is an arithmetic number, because the mean of its divisors is an integer number (4334342434341).

Almost surely, 2^{8668684868681} is an apocalyptic number.

It is an amenable number.

8668684868681 is a deficient number, since it is larger than the sum of its proper divisors (1).

8668684868681 is an equidigital number, since it uses as much as digits as its factorization.

8668684868681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8153726976, while the sum is 83.

The spelling of 8668684868681 in words is "eight trillion, six hundred sixty-eight billion, six hundred eighty-four million, eight hundred sixty-eight thousand, six hundred eighty-one".