I have connected Java program to Oracle database using JDBC. I want to store BigInteger values(512 bits) in the database. What should be the type of the column?

I m trying like this:

I have taken a column of number type in the database.

I converted BigInteger to BigDecimal like this:

BigInteger b=new BigInteger("5779857570957802579079");
Number n =b;
BigDecimal d=(BigDecimal)n;

PreparedStatement pstmt=con.prepareStatemant("insert into database values(?,?)");
pstmt.setString(1,"john");
pstmt.setBigDecimal(2,d);

I am getting the following exception:

javax.servlet.ServletException: java.lang.ClassCastException: java.math.BigInteger cannot be cast to java.math.BigDecimal
root cause 

java.lang.ClassCastException: java.math.BigInteger cannot be cast to java.math.BigDecimal

Is there anything wrong in this code snippet? If there is, please suggest other methods.