Hex #509eaa or rgb(80,158,170) in RGB space is the tint of bluish cian. It has hue angle of 188.00 degrees, value = 67 and saturation = 53. #509eaa can be obtained by mixing 4 colors: 1 drop of blue, 5 drops of cyan, 5 drops of white, 5 drops of black.
Nearest safe hex - #669999. Below you can see the block with #509eaa color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #509eaa to the mixer and play with it.