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If you form the digits with a seven-segment LED display, then all of the digits except '1' have perpendicular lines.
56
The title comes from the Bible - the Book of Proverbs, 9:1: "Wisdom hath builded her house, she hath hewn out her seven pillars" (KJV). Just before World War I, Lawrence began work on a book about seven great cities of the Middle East. His chosen title was to be: Seven Pillars of Wisdom. But When war broke out, it was still incomplete and Lawrence said he had destroyed his manuscript. But he was still determined to use the original title for his later work. After two failures, he finally succeeded by starting from scratch, once again, after he lost his original manuscript on a train.
Twenty trillion seven hundred and seven billion seven hundred and twenty seven million seven hundred and seventy seven thousand = 20,707,727,777,000
7,000,707 = seven million, seven hundred and seven