12157692622039623539 = 1¹ + 2² + 1³ + 5⁴ + 7⁵ + 6⁶ + 9⁷ + 2⁸ + 6⁹ + 2¹⁰ + 2¹¹ + 0¹² + 3¹³ + 9¹⁴ + 6¹⁵ + 2¹⁶ + 3¹⁷ + 5¹⁸ + 3¹⁹ + 9²⁰

(The largest such number.)