CREATE TABLE table_27097 ("#" FLOAT, "Title" TEXT, "Director" TEXT, "Writer ( s ) " TEXT, "Viewers" TEXT, "Air date" TEXT, "Production code" FLOAT)

When 6.66 is the amount of viewers what is the lowest production code?
SELECT MIN("Production code") FROM table_27097 WHERE "Viewers" = '6.66'
SELECT MIN("Production code") FROM "table_27097" WHERE "Viewers" = '6.66'