Hex #667b56 or rgb(102,123,86) in RGB space is the tint of olive. It has hue angle of 94.05 degrees, value = 48 and saturation = 30. #667b56 can be obtained by mixing 4 colors: 2 drops of yellow, 2 drops of magenta, 3 drops of blue, 3 drops of green.
Nearest safe hex - #666666. Below you can see the block with #667b56 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #667b56 to the mixer and play with it.