This number is a prime.

                                                                1 3323377777

+ The smallest prime that has more than 100 letters when spelled out in English (thirteen billion three hundred twenty-three million three hundred seventy-seven thousand seven hundred seventy-seven). If you say "and" after each (resp. the last) "hundred," the smallest such prime is 1117373377 (resp. 3323373377). [Yosei]

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