76686633668647 has 2 divisors, whose sum is σ = 76686633668648. Its totient is φ = 76686633668646.

The previous prime is 76686633668633. The next prime is 76686633668669. The reversal of 76686633668647 is 74686633668667.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 76686633668647 - 2²⁷ = 76686499450919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76686633668627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38343316834323 + 38343316834324.

It is an arithmetic number, because the mean of its divisors is an integer number (38343316834324).

Almost surely, 2^{76686633668647} is an apocalyptic number.

76686633668647 is a deficient number, since it is larger than the sum of its proper divisors (1).

76686633668647 is an equidigital number, since it uses as much as digits as its factorization.

76686633668647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31603654656, while the sum is 82.

The spelling of 76686633668647 in words is "seventy-six trillion, six hundred eighty-six billion, six hundred thirty-three million, six hundred sixty-eight thousand, six hundred forty-seven".