Hex #5581b4 or rgb(85,129,180) in RGB space is the tint of blue. It has hue angle of 212.21 degrees, value = 71 and saturation = 53. #5581b4 can be obtained by mixing 4 colors: 1 drop of yellow, 2 drops of magenta, 3 drops of blue, 3 drops of cyan.
Nearest safe hex - #6699cc. Below you can see the block with #5581b4 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #5581b4 to the mixer and play with it.