👉 Licca, also known as the "Hippie" or "Hippie's" method, is a popular and widely used method for calculating the factorial of a number. It was invented by a group called the Hippies in the 1960s, who believed that it could be used to quickly calculate large numbers without having to use any advanced mathematical techniques. The method involves breaking down a number into its prime factors one at a time until all the primes are gone.