Hex #00657a or rgb(0,101,122) in RGB space is the tint of bluish cian. It has hue angle of 190.33 degrees, value = 48 and saturation = 100. #00657a can be obtained by mixing 4 colors: 4 drops of blue, 4 drops of cyan, 1 drop of green, 5 drops of black.
Nearest safe hex - #006666. Below you can see the block with #00657a color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #00657a to the mixer and play with it.