SQL & PL/SQL :: Create Table Statement Length Greater Than 4000?

I've to create a table which has 650 fields and the total length of CREATE TABLE statement got to be more than 4000 characters.I've to create the table by inserting the CREATE TABLE statment in a variable (V1) then by using EXECUTE IMMEDIATE V1 Since VARCHAR2 only supports upto 4000 characters length string, how can I create such table??

DECLARE
V1 VARCHAR2(4000);
BEGIN
V1 :=
-- CREATE TALBE STATEMENT WITH LENGTH MORE THAN 4000
EXECUTE IMMEDIATE V1;
END;

Quote:got the error -- PL/SQL: numeric or value error: character string buffer too small

How can I create such table??