Hex #55ac71 or rgb(85,172,113) in RGB space is the tint of bluish green. It has hue angle of 139.31 degrees, value = 67 and saturation = 51. #55ac71 can be obtained by mixing 4 colors: 1 drop of cyan, 3 drops of green, 3 drops of white, 2 drops of black.
Nearest safe hex - #669966. Below you can see the block with #55ac71 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #55ac71 to the mixer and play with it.