Hex #663c2e or rgb(102,60,46) in RGB space is the tint of orange red. It has hue angle of 15.00 degrees, value = 40 and saturation = 55. #663c2e can be obtained by mixing 4 colors: 2 drops of red, 4 drops of magenta, 5 drops of green, 4 drops of black.
Nearest safe hex - #663333. Below you can see the block with #663c2e color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #663c2e to the mixer and play with it.