Genesis 9:28 Kabbalah

וַֽיְחִי־נֹ֖חַ אַחַ֣ר הַמַּבּ֑וּל שְׁלֹ֤שׁ מֵאוֹת֙ שָׁנָ֔ה וַֽחֲמִשִּׁ֖ים שָׁנָֽה׃

And Noah lived after the flood three hundred and fifty years.

Read kabbalistic (mystical) interpretation of Genesis 9:28: and classical mystical sources.