Hex #5580a3 or rgb(85,128,163) in RGB space is the tint of blue. It has hue angle of 206.92 degrees, value = 64 and saturation = 48. #5580a3 can be obtained by mixing 4 colors: 4 drops of blue, 1 drop of cyan, 4 drops of white, 3 drops of black.
Nearest safe hex - #669999. Below you can see the block with #5580a3 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #5580a3 to the mixer and play with it.