ORA-01722无效数字 PLSQL

declare

cursor orderTypeId is
    select order_type_id from order_type  where order_type_id in
        (select distinct order_type_id 
         from business_2_flow_template 
         where prod_spec_id in ('650020001','650025381'));                  
cursor areaId is
    select distinct area_id 
    from dynamic_rule 
    where prod_spec_id in ('650020001','650025381') and area_id like'%00%';

begin

for o in orderTypeId loop
    for d in areaId loop
        if (o.order_type_id=21538)or(o.order_type_id=21)or(o.order_type_id=7539)or(o.order_type_id=7538) then
            insert into dynamic_rule
            (area_id,prod_spec_id,order_type_id,tache_ids,seq,rule_string,priority,dynamic_type)
            values (d.area_id,'650020001','','DT0735','1','10045='+o.order_type_id,'1','A');
            insert into dynamic_rule
            (area_id,prod_spec_id,order_type_id,tache_ids,seq,rule_string,priority,dynamic_type)
            values (d.area_id,'650025381','','DT0735','1','10045='+o.order_type_id,'1','A');                                
        else                
            insert into dynamic_rule
            (area_id,prod_spec_id,order_type_id,tache_ids,seq,rule_string,priority,dynamic_type)
            values (d.area_id,'650020001','','DT0733','1','10045='+o.order_type_id,'1','A');
            insert into dynamic_rule
            (area_id,prod_spec_id,order_type_id,tache_ids,seq,rule_string,priority,dynamic_type)
            values (d.area_id,'650025381','','DT0733','1','10045='+o.order_type_id,'1','A');
        end if;
    end loop;
end loop;

end;

报错信息如下：
ORA-01722无效数字

考虑到可能是数据类型问题，特给出关键字段数据类型如下：
Name Type Nullable Default Comments

AREA_ID NUMBER(5)

PROD_SPEC_ID NUMBER(9)

ORDER_TYPE_ID NUMBER(6)

ITEM_SPEC_ID NUMBER(10)

NEW_ACTION NUMBER(5) Y

JOB_SPEC_ID VARCHAR2(6)

NEW_VALUE_SET VARCHAR2(2000) Y

OLD_VALUE_SET VARCHAR2(2000) Y

RELA_TYPE CHAR(1) Y

RELA_ITEM_SPEC_ID NUMBER(5) Y

RELA_NEW_VALUE_SET VARCHAR2(200) Y

RELA_OLD_VALUE_SET VARCHAR2(200) Y

RELA_NEW_ACTION NUMBER(5) Y

希望各路神仙施予援手，谢谢！

追加说明：

问题出在begin下面的插入语句中

insert into dynamic_rule
(area_id,prod_spec_id,order_type_id,tache_ids,seq,rule_string,priority,dynamic_type)
values (d.area_id,'650020001','','DT0735','1','10045='+o.order_type_id,'1','A');
你先执行一些这条插入语句，d.area_id，o.order_type_id, 按照你的规则先编一下；

                    -- '650020001'，-- prod_spec_id  应该是这个的问题