Hex #557997 or rgb(85,121,151) in RGB space is the tint of blue. It has hue angle of 207.27 degrees, value = 59 and saturation = 44. #557997 can be obtained by mixing 3 colors: 3 drops of red, 2 drops of blue, 4 drops of cyan.
Nearest safe hex - #666699. Below you can see the block with #557997 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #557997 to the mixer and play with it.