SQL Help in procedure IN statement

I ve follow procedure im SQL Server:

      alter procedure sp_selectfFriends_by_cities
        (
            @txt_id_usuarios varchar(300)
        )
        as
        begin
        declare @sql varchar(300)
        set @sql = 'select
                     a.int_id_usuario, 
                     a.int_id_cidade,
                     b.txt_nome_cidade,
                     b.txt_nome_estado 
                     from
                      tb_cidades_visitadas a 
                      left join 
                      tb_cidades 

      b on b.int_id_cidade = a.int_id_cidade
 where int_id_usuario in (' + @txt_id_usuarios + ')'
                execute(@sql) 
        end

Where @txt_id_usuarios is a list of users separated by commas,and the field int_id_usuario is type of BIGINT. ie:

'6663225047,1122675730,1591119304,1664930592,1685923789,100000235882380,100000292471037,100000466411115'

When i try to exe开发者_StackOverflowcute it passing that string as parameter,it returns me follow error: Incorrect syntax near '1685923789'.

But there is NO incorrect syntax.

Stranger if I remove some IDs it works. I.E:

'6663225047,1122675730,1591119304,1664930592'

Works fine!

Any ideias?

---

Yes

declare @sql varchar(300)

This will limit your string to 300 chars. You need to make it longer