Hex #557c9f or rgb(85,124,159) in RGB space is the tint of blue. It has hue angle of 208.38 degrees, value = 62 and saturation = 47. #557c9f can be obtained by mixing 4 colors: 5 drops of blue, 1 drop of cyan, 5 drops of white, 4 drops of black.
Nearest safe hex - #666699. Below you can see the block with #557c9f color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #557c9f to the mixer and play with it.