Definition: It's an ancient Hebrew number. The number of "fifteen thousand nine hundred eighty-seven five three" in Hebrew was used to denote a specific event, possibly related to an ancient Babylonian calendar or recordkeeping system. Detailed definitions vary: one possibility is that it represented a year (1598753) with a specific day (the 1st of January), and another might refer to a number of years, as in "fifteen thousand nine hundred eighty-seven fifty-three".
1598753