Hex #55517b or rgb(85,81,123) in RGB space is the tint of violet. It has hue angle of 245.71 degrees, value = 48 and saturation = 34. #55517b can be obtained by mixing 4 colors: 2 drops of magenta, 2 drops of cyan, 1 drop of white, 4 drops of black.
Nearest safe hex - #666666. Below you can see the block with #55517b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #55517b to the mixer and play with it.