6.4375e+20 mega electrons equals 24.62 calories.
Convert 6.4375e+20 mega electrons into joules, kilojoules, megajoules, newton meters, foot pounds, watt hours, kilowatt hours, megawatt hours, etc...
Convert 25 calories into joules, kilojoules, megajoules, newton meters, foot pounds, watt hours, kilowatt hours, megawatt hours, etc...