Hex #667c4f or rgb(102,124,79) in RGB space is the tint of olive. It has hue angle of 89.33 degrees, value = 49 and saturation = 36. #667c4f can be obtained by mixing 4 colors: 5 drops of red, 1 drop of magenta, 4 drops of cyan, 5 drops of green.
Nearest safe hex - #666666. Below you can see the block with #667c4f color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #667c4f to the mixer and play with it.