CREATE TABLE table_21015 ("Model number" TEXT, "sSpec number" TEXT, "Frequency" TEXT, "GPU frequency" TEXT, "L2 cache" TEXT, "I/O bus" TEXT, "Memory" TEXT, "Voltage" TEXT, "TDP" TEXT, "Socket" TEXT, "Release date" TEXT, "Part number ( s ) " TEXT, "Release price  (  USD  ) " TEXT)

For a processor with model number atom e665c and a TDP of 3.6 W, what is the sSpec number?
SELECT "sSpec number" FROM table_21015 WHERE "TDP" = '3.6 W' AND "Model number" = 'Atom E665C'
SELECT "sSpec number" FROM "table_21015" WHERE "Model number" = 'Atom E665C' AND "TDP" = '3.6 W'