Hex #5b9ea4 or rgb(91,158,164) in RGB space is the tint of cyan. It has hue angle of 184.93 degrees, value = 64 and saturation = 45. #5b9ea4 can be obtained by mixing 4 colors: 1 drop of red, 5 drops of cyan, 4 drops of white, 4 drops of black.
Nearest safe hex - #669999. Below you can see the block with #5b9ea4 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #5b9ea4 to the mixer and play with it.