How to delete tablespace and table after delete datafiles?
According to the My Oracle Support documents, you might have hit Bug 19579109 : DROP TABLESPACE HANG ON RECURSIVE SQL. 

Possible workaround would be to make sure that all paritions have statistics gathered before the drop table or set event 14534 before drop command as shown below.

alter session set events '14534 trace name context forever, level 1';
drop table &lt;table_name&gt;;


Refer to the MOS document for details.

Reference: Drop Tablespace Command Slow or Hanging (Doc ID 2060324.1)