1 Em (Exameter) is equal to 999,999,999,999.9999 Mm (Megameter). To convert from Exameter to Megameter, multiply by 999,999,999,999.9999 or divide by 0.0000000000010000000000000002.
Nine Hundred Ninety-Nine Billion Nine Hundred Ninety-Nine Million Nine Hundred Ninety-Nine Thousand Nine Hundred Ninety-Nine Point Nine Nine Nine Nine Megameter