6686791 has 6 divisors (see below), whose sum is σ = 6926192. Its totient is φ = 6455400.

The previous prime is 6686789. The next prime is 6686843. The reversal of 6686791 is 1976866.

It is not a de Polignac number, because 6686791 - 2¹ = 6686789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6686711) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3135 + ... + 4816.

Almost surely, 2^6686791 is an apocalyptic number.

6686791 is a deficient number, since it is larger than the sum of its proper divisors (239401).

6686791 is an equidigital number, since it uses as much as digits as its factorization.

6686791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8009 (or 7980 counting only the distinct ones).

The product of its digits is 108864, while the sum is 43.

The square root of 6686791 is about 2585.8830213295. The cubic root of 6686791 is about 188.3963927678.

The spelling of 6686791 in words is "six million, six hundred eighty-six thousand, seven hundred ninety-one".