Hex #555d9d or rgb(85,93,157) in RGB space is the tint of violet. It has hue angle of 233.33 degrees, value = 62 and saturation = 46. #555d9d can be obtained by mixing 4 colors: 2 drops of magenta, 2 drops of blue, 1 drop of cyan, 1 drop of green.
Nearest safe hex - #666699. Below you can see the block with #555d9d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #555d9d to the mixer and play with it.