Hex #5b9b98 or rgb(91,155,152) in RGB space is the tint of cyan. It has hue angle of 177.19 degrees, value = 61 and saturation = 41. #5b9b98 can be obtained by mixing 4 colors: 5 drops of blue, 3 drops of green, 5 drops of white, 1 drop of black.
Nearest safe hex - #669999. Below you can see the block with #5b9b98 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #5b9b98 to the mixer and play with it.