Hex #55667b or rgb(85,102,123) in RGB space is the tint of blue. It has hue angle of 213.16 degrees, value = 48 and saturation = 31. #55667b can be obtained by mixing 4 colors: 3 drops of magenta, 2 drops of blue, 1 drop of cyan, 3 drops of green.
Nearest safe hex - #666666. Below you can see the block with #55667b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #55667b to the mixer and play with it.