Hex #5b9b92 or rgb(91,155,146) in RGB space is the tint of greenish cian. It has hue angle of 171.56 degrees, value = 61 and saturation = 41. #5b9b92 can be obtained by mixing 4 colors: 3 drops of cyan, 1 drop of green, 5 drops of white, 5 drops of black.
Nearest safe hex - #669999. Below you can see the block with #5b9b92 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #5b9b92 to the mixer and play with it.