6686143 has 4 divisors (see below), whose sum is σ = 6777808. Its totient is φ = 6594480.

The previous prime is 6686107. The next prime is 6686167. The reversal of 6686143 is 3416866.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6686143 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6686099 and 6686108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6686243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45723 + ... + 45868.

It is an arithmetic number, because the mean of its divisors is an integer number (1694452).

Almost surely, 2^6686143 is an apocalyptic number.

6686143 is a deficient number, since it is larger than the sum of its proper divisors (91665).

6686143 is an equidigital number, since it uses as much as digits as its factorization.

6686143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91664.

The product of its digits is 20736, while the sum is 34.

The square root of 6686143 is about 2585.7577226028. The cubic root of 6686143 is about 188.3903068986.

The spelling of 6686143 in words is "six million, six hundred eighty-six thousand, one hundred forty-three".