How many users can WordPress handle?

According WP database structure, ID in wp_users is Bigint(20) UNSIGNED, so you could “theoretically” add 18446744073709551615 users.
http://dev.mysql.com/doc/refman/4.1/en/integer-types.html

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)