SELECT MIN("Number (map)") FROM table_33848 WHERE "Area in km\u00b2" = '9.7' AND "Population Canada 2011 Census" > '66,158'
Which Number (map) is the lowest one that has a Area in km of 9.7, and a Population Canada 2011 Census larger than 66,158?
CREATE TABLE table_33848 (
    "Number (map)" real,
    "Borough" text,
    "Population Canada 2011 Census" real,
    "Area in km\u00b2" real,
    "Density per km\u00b2" real
)