Hex #666611 or rgb(102,102,17) in RGB space is the tint of yellow. It has hue angle of 60.00 degrees, value = 40 and saturation = 83. #666611 can be obtained by mixing 3 colors: 4 drops of yellow, 1 drop of blue, 5 drops of black.
Nearest safe hex - #666600. Below you can see the block with #666611 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #666611 to the mixer and play with it.