Hex #556c9d or rgb(85,108,157) in RGB space is the tint of blue violet. It has hue angle of 220.83 degrees, value = 62 and saturation = 46. #556c9d can be obtained by mixing 4 colors: 1 drop of magenta, 3 drops of blue, 1 drop of green, 1 drop of white.
Nearest safe hex - #666699. Below you can see the block with #556c9d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #556c9d to the mixer and play with it.