Hex #666b5e or rgb(102,107,94) in RGB space is the tint of olive. It has hue angle of 83.08 degrees, value = 42 and saturation = 12. #666b5e can be obtained by mixing 4 colors: 1 drop of yellow, 1 drop of blue, 3 drops of white, 5 drops of black.
Nearest safe hex - #666666. Below you can see the block with #666b5e color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #666b5e to the mixer and play with it.