Hex #666d22 or rgb(102,109,34) in RGB space is the tint of yellow. It has hue angle of 65.60 degrees, value = 43 and saturation = 69. #666d22 can be obtained by mixing 3 colors: 1 drop of red, 1 drop of magenta, 3 drops of green.
Nearest safe hex - #666633. Below you can see the block with #666d22 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #666d22 to the mixer and play with it.