Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
When 6.66 is the amount of viewers what is the lowest production code?

### Inputs:
table_name: table, columns: ['#', 'Title', 'Director', 'Writer(s)', 'Viewers', 'Air date', 'Production code']

### Response:
SELECT MIN Production code FROM table WHERE Viewers = 6.66