Il numero 1661, milleseicentosessantuno in Italiano, in Inglese si dice one thousand six hundred sixty-one.
Il numero ordinale 1661° in inglese si dice one thousand six hundred sixty-first.
1652: one thousand six hundred fifty-two
1653: one thousand six hundred fifty-three
1654: one thousand six hundred fifty-four
1655: one thousand six hundred fifty-five
1656: one thousand six hundred fifty-six
1657: one thousand six hundred fifty-seven
1658: one thousand six hundred fifty-eight
1659: one thousand six hundred fifty-nine
1660: one thousand six hundred sixty
1662: one thousand six hundred sixty-two
1663: one thousand six hundred sixty-three
1664: one thousand six hundred sixty-four
1665: one thousand six hundred sixty-five
1666: one thousand six hundred sixty-six
1667: one thousand six hundred sixty-seven
1668: one thousand six hundred sixty-eight
1669: one thousand six hundred sixty-nine
1670: one thousand six hundred seventy