SQL & PL/SQL :: Create Table With Author Column Default Value As Administrator

I am trying to write a script to create a table with the author column default value as "Administrator" I use this execute immediate statement1;

Why does it create the table successfully with ',AUTHOR VARCHAR2(30) DEFAULT 1' and NOT with ',AUTHOR VARCHAR2(30) DEFAULT Administrator' ?

I want to set the COLUMN DEFAULT have to "Administrator" when I create the table.

When I try character I get this error "ORA-00984: column not allowed here"

statement1:='CREATE table TEST_ID2'
||'(TEST_ID NUMBER(6)'
||',test_name VARCHAR2(40)'
||notnull||
',date_created DATE DEFAULT SYSDATE '

[code]....