Il numero 661, seicentosessantuno in Italiano, in Inglese si dice six hundred sixty-one.
Il numero ordinale 661° in inglese si dice six hundred sixty-first.
652: six hundred fifty-two
653: six hundred fifty-three
654: six hundred fifty-four
655: six hundred fifty-five
656: six hundred fifty-six
657: six hundred fifty-seven
658: six hundred fifty-eight
659: six hundred fifty-nine
660: six hundred sixty
662: six hundred sixty-two
663: six hundred sixty-three
664: six hundred sixty-four
665: six hundred sixty-five
666: six hundred sixty-six
667: six hundred sixty-seven
668: six hundred sixty-eight
669: six hundred sixty-nine
670: six hundred seventy