Hex #665839 or rgb(102,88,57) in RGB space is the tint of khaki. It has hue angle of 41.33 degrees, value = 40 and saturation = 44. #665839 can be obtained by mixing 4 colors: 1 drop of yellow, 5 drops of red, 5 drops of blue, 4 drops of green.
Nearest safe hex - #666633. Below you can see the block with #665839 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #665839 to the mixer and play with it.