Hex #66682b or rgb(102,104,43) in RGB space is the tint of yellow. It has hue angle of 61.97 degrees, value = 41 and saturation = 59. #66682b can be obtained by mixing 4 colors: 3 drops of yellow, 1 drop of blue, 1 drop of white, 5 drops of black.
Nearest safe hex - #666633. Below you can see the block with #66682b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66682b to the mixer and play with it.