806685643 has 4 divisors (see below), whose sum is σ = 813824568. Its totient is φ = 799546720.

The previous prime is 806685631. The next prime is 806685653. The reversal of 806685643 is 346586608.

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

It is a cyclic number.

It is not a de Polignac number, because 806685643 - 2²⁵ = 773131211 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 806685593 and 806685602.

It is not an unprimeable number, because it can be changed into a prime (806685613) 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, 3569293 + ... + 3569518.

It is an arithmetic number, because the mean of its divisors is an integer number (203456142).

Almost surely, 2^806685643 is an apocalyptic number.

806685643 is a deficient number, since it is larger than the sum of its proper divisors (7138925).

806685643 is a wasteful number, since it uses less digits than its factorization.

806685643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7138924.

The product of its (nonzero) digits is 829440, while the sum is 46.

The square root of 806685643 is about 28402.2119385093. The cubic root of 806685643 is about 930.8965966926.

The spelling of 806685643 in words is "eight hundred six million, six hundred eighty-five thousand, six hundred forty-three".