Hex #665733 or rgb(102,87,51) in RGB space is the tint of khaki. It has hue angle of 42.35 degrees, value = 40 and saturation = 50. #665733 can be obtained by mixing 4 colors: 1 drop of red, 1 drop of green, 1 drop of white, 2 drops of black.
Nearest safe hex - #666633. Below you can see the block with #665733 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #665733 to the mixer and play with it.