6686894986823 has 2 divisors, whose sum is σ = 6686894986824. Its totient is φ = 6686894986822.

The previous prime is 6686894986819. The next prime is 6686894986897. The reversal of 6686894986823 is 3286894986866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6686894986823 - 2² = 6686894986819 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6686894986523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3343447493411 + 3343447493412.

It is an arithmetic number, because the mean of its divisors is an integer number (3343447493412).

Almost surely, 2^{6686894986823} is an apocalyptic number.

6686894986823 is a deficient number, since it is larger than the sum of its proper divisors (1).

6686894986823 is an equidigital number, since it uses as much as digits as its factorization.

6686894986823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10319560704, while the sum is 83.

The spelling of 6686894986823 in words is "six trillion, six hundred eighty-six billion, eight hundred ninety-four million, nine hundred eighty-six thousand, eight hundred twenty-three".