This is what you can achieve after learning the effective memory techniques!
Mr. Nishant who graciously allowed us to video him for a demonstration narrated this numbers only after we narrated to him this long numbers once! If you do not believe in his abilities, you can always check his profile. He has memorized few thousands of digits accurately, seven decks of cards in order...etc. He used these effective memory techniques and practiced with it, therefore able to achieve this feat.