The app can calculate factorial upto '33 333'. The original algorithm of the app was supporting upto '999 999' but was restricted to '33 333' due to limited processing power of smartphones. The app project is open-sourced at Github (https://github.com/devgeekco/calc_factorial_app). This application is an experimental app for learning NDK development. The main logic of the calculating large factorial was written in C and system precision is not used for storing large factorial.