Hex #555498 or rgb(85,84,152) in RGB space is the tint of violet. It has hue angle of 240.88 degrees, value = 60 and saturation = 45. #555498 can be obtained by mixing 4 colors: 2 drops of red, 1 drop of magenta, 4 drops of blue, 2 drops of cyan.
Nearest safe hex - #666699. Below you can see the block with #555498 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #555498 to the mixer and play with it.