Hex #664533 or rgb(102,69,51) in RGB space is the tint of orange red. It has hue angle of 21.18 degrees, value = 40 and saturation = 50. #664533 can be obtained by mixing 4 colors: 2 drops of red, 1 drop of green, 2 drops of white, 5 drops of black.
Nearest safe hex - #663333. Below you can see the block with #664533 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #664533 to the mixer and play with it.