Hex #557184 or rgb(85,113,132) in RGB space is the tint of blue. It has hue angle of 204.26 degrees, value = 52 and saturation = 36. #557184 can be obtained by mixing 4 colors: 3 drops of red, 1 drop of blue, 4 drops of cyan, 1 drop of black.
Nearest safe hex - #666699. Below you can see the block with #557184 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #557184 to the mixer and play with it.