Hex #555d77 or rgb(85,93,119) in RGB space is the tint of blue violet. It has hue angle of 225.88 degrees, value = 47 and saturation = 29. #555d77 can be obtained by mixing 4 colors: 5 drops of red, 3 drops of blue, 5 drops of cyan, 2 drops of black.
Nearest safe hex - #666666. Below you can see the block with #555d77 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #555d77 to the mixer and play with it.