Hex #664039 or rgb(102,64,57) in RGB space is the tint of orange red. It has hue angle of 9.33 degrees, value = 40 and saturation = 44. #664039 can be obtained by mixing 4 colors: 1 drop of yellow, 5 drops of magenta, 4 drops of green, 5 drops of black.
Nearest safe hex - #663333. Below you can see the block with #664039 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #664039 to the mixer and play with it.