Challenge number, derived from your birth date, is the number that explains the challenges you are likely to face in your lifetime. It offers guidance to you to overcome those challenges. Confronting the hardships that come your way with all your strengths and positivity is what makes you human, the best creation of God. Challenge-number calculation is based on your date of birth in an MMDDYY format. The early challenge number stays till your mid-life. After that, comes the mid-life challenge number and after that, the main challenge number descends. The final one is the late life challenge number. In the study of numerology, challenge number is the only place where the occurs and it is said that if the main challenge number happens to be 0 in your case, you must have faced a lot of challenges in your life already.