27686668389643 has 2 divisors, whose sum is σ = 27686668389644. Its totient is φ = 27686668389642.

The previous prime is 27686668389637. The next prime is 27686668389707. The reversal of 27686668389643 is 34698386668672.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27686668389643 is a prime.

It is not a weakly prime, because it can be changed into another prime (27686668384643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13843334194821 + 13843334194822.

It is an arithmetic number, because the mean of its divisors is an integer number (13843334194822).

Almost surely, 2^{27686668389643} is an apocalyptic number.

27686668389643 is a deficient number, since it is larger than the sum of its proper divisors (1).

27686668389643 is an equidigital number, since it uses as much as digits as its factorization.

27686668389643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18059231232, while the sum is 82.

The spelling of 27686668389643 in words is "twenty-seven trillion, six hundred eighty-six billion, six hundred sixty-eight million, three hundred eighty-nine thousand, six hundred forty-three".