Hex #55a9b5 or rgb(85,169,181) in RGB space is the tint of bluish cian. It has hue angle of 187.50 degrees, value = 71 and saturation = 53. #55a9b5 can be obtained by mixing 4 colors: 1 drop of blue, 5 drops of cyan, 5 drops of white, 4 drops of black.
Nearest safe hex - #6699cc. Below you can see the block with #55a9b5 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #55a9b5 to the mixer and play with it.