SELECT TO_CHAR (TO_DATE (6929104, 'J'), 'JSP') AS converted_form
  FROM DUAL

ORA-01854: julian date must be between 1 and 5373484

SQL> create table test (col date);

Table created.

SQL> insert into test (col) values (to_date('28.05.10020', 'dd.mm.yyyyy'));
insert into test (col) values (to_date('28.05.10020', 'dd.mm.yyyyy'))
                                                      *
ERROR at line 1:
ORA-01812: year may only be specified once


SQL> insert into test (col) values (to_date('28.05.10020', 'dd.mm.yyyy'));
insert into test (col) values (to_date('28.05.10020', 'dd.mm.yyyy'))
                                       *
ERROR at line 1:
ORA-01830: date format picture ends before converting entire input string


SQL>

CREATE OR REPLACE FUNCTION spell_number (p_number IN NUMBER)
   RETURN VARCHAR2
AS
   TYPE myarray IS TABLE OF VARCHAR2 (255);

   l_str      myarray
      := myarray ('',
                  ' thousand ',
                  ' million ',
                  ' billion ',
                  ' trillion ',
                  ' quadrillion ',
                  ' quintillion ',
                  ' sextillion ',
                  ' septillion ',
                  ' octillion ',
                  ' nonillion ',
                  ' decillion ',
                  ' undecillion ',
                  ' duodecillion '
                 );
   l_num      VARCHAR2 (50)   DEFAULT TRUNC (p_number);
   l_return   VARCHAR2 (4000);
BEGIN
   FOR i IN 1 .. l_str.COUNT
   LOOP
      EXIT WHEN l_num IS NULL;

      IF (SUBSTR (l_num, LENGTH (l_num) - 2, 3) <> 0)
      THEN
         l_return :=
               TO_CHAR (TO_DATE (SUBSTR (l_num, LENGTH (l_num) - 2, 3), 'J'),
                        'Jsp'
                       )
            || l_str (i)
            || l_return;
      END IF;

      l_num := SUBSTR (l_num, 1, LENGTH (l_num) - 3);
   END LOOP;

   RETURN l_return;
END;
/

select  spell_number(6929104) from dual

Output : Six million Nine Hundred Twenty-Nine thousand One Hundred Four

ind>  select  spell_number(6929104.99)  from dual;

SPELL_NUMBER(6929104.99)
--------------------------------------------------------------------------------
six million nine hundred twenty-nine thousand one hundred four

1 row selected.

ind>  select f_words(6929104.99)  from dual;

F_WORDS(6929104.99)
--------------------------------------------------------------------------------
Sixty-Nine Lakh Twenty-Nine Thousand One Hundred Four and Paise Ninety-Nine

1 row selected.