Hex #555772 or rgb(85,87,114) in RGB space is the tint of violet. It has hue angle of 235.86 degrees, value = 45 and saturation = 25. #555772 can be obtained by mixing 3 colors: 1 drop of yellow, 1 drop of red, 4 drops of blue.
Nearest safe hex - #666666. Below you can see the block with #555772 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #555772 to the mixer and play with it.