16686856843 has 2 divisors, whose sum is σ = 16686856844. Its totient is φ = 16686856842.

The previous prime is 16686856811. The next prime is 16686856861. The reversal of 16686856843 is 34865868661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16686856843 - 2⁵ = 16686856811 is a prime.

It is not a weakly prime, because it can be changed into another prime (16686856873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8343428421 + 8343428422.

It is an arithmetic number, because the mean of its divisors is an integer number (8343428422).

Almost surely, 2^16686856843 is an apocalyptic number.

16686856843 is a deficient number, since it is larger than the sum of its proper divisors (1).

16686856843 is an equidigital number, since it uses as much as digits as its factorization.

16686856843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39813120, while the sum is 61.

The spelling of 16686856843 in words is "sixteen billion, six hundred eighty-six million, eight hundred fifty-six thousand, eight hundred forty-three".