I just recently applied the 8.0.5.2.1 patch so mine is

SQL> select * from v$version;

BANNER
----------------------------------------------------------------
Oracle8 Enterprise Edition Release 8.0.5.2.1 - Production
PL/SQL Release 8.0.5.2.0 - Production
CORE Version 4.0.5.0.0 - Production
TNS for Solaris: Version 8.0.5.0.0 - Production
NLSRTL Version 3.3.2.0.0 - Production

SQL>

The readme.txt for the patch is at [url]ftp://192.86.152.21/pub/patches/patchsets/610/80521/README.txt[/url] . It's actually in HTML format but they saved it as a .txt, so for easier reading you might have to save it and open it locally in a browser.

The only thing regarding to_number in the patch set is "PLSQL assignment using TO_NUMBER dumps when ORA-1722 expected"