Colors in #A65CDA format are called hexadecimal color codes. The six digits are divided into three groups, one for each of the two digits, in order of the intensity of the red, yellow, and blue colors. The three digit combinations correspond to the three decimal digits of rgb(166,92,218).
Therefore, to convert rgb format to hexadecimal, only three values need to be converted to hexadecimal. Otherwise, reverse the conversion.