Hex #5b9fa4 or rgb(91,159,164) in RGB space is the tint of cyan. It has hue angle of 184.11 degrees, value = 64 and saturation = 45. #5b9fa4 can be obtained by mixing 3 colors: 4 drops of cyan, 5 drops of white, 5 drops of black.
Nearest safe hex - #669999. Below you can see the block with #5b9fa4 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #5b9fa4 to the mixer and play with it.