Hex #667477 or rgb(102,116,119) in RGB space is the tint of bluish cian. It has hue angle of 190.59 degrees, value = 47 and saturation = 14. #667477 can be obtained by mixing 4 colors: 1 drop of red, 2 drops of blue, 1 drop of green, 1 drop of white.
Nearest safe hex - #666666. Below you can see the block with #667477 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #667477 to the mixer and play with it.