Hex #666a44 or rgb(102,106,68) in RGB space is the tint of yellow. It has hue angle of 66.32 degrees, value = 42 and saturation = 36. #666a44 can be obtained by mixing 4 colors: 2 drops of yellow, 1 drop of blue, 2 drops of white, 5 drops of black.
Nearest safe hex - #666633. Below you can see the block with #666a44 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #666a44 to the mixer and play with it.