6685643 has 2 divisors, whose sum is σ = 6685644. Its totient is φ = 6685642.

The previous prime is 6685633. The next prime is 6685667. The reversal of 6685643 is 3465866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6685643 - 2¹² = 6681547 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6685597 and 6685606.

It is not a weakly prime, because it can be changed into another prime (6685603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3342821 + 3342822.

It is an arithmetic number, because the mean of its divisors is an integer number (3342822).

Almost surely, 2^6685643 is an apocalyptic number.

6685643 is a deficient number, since it is larger than the sum of its proper divisors (1).

6685643 is an equidigital number, since it uses as much as digits as its factorization.

6685643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 38.

The square root of 6685643 is about 2585.6610373365. The cubic root of 6685643 is about 188.3856107431.

The spelling of 6685643 in words is "six million, six hundred eighty-five thousand, six hundred forty-three".