Is Sixteenth Century Hyphenated?

Centuries conform to the general rule for hyphenating a compound adjective. When it comes before the noun, include century in the hyphenation (in the case of twenty-first century and above). Afterward, do not (CMOS).

Is Twentieth Century hyphenated?

The hyphenated form lends itself better to compound modifiers, as in “mid-twentieth-century furniture.” So when the less common noun phrase is used, we prefer to retain the hyphen: “mid-twentieth century.” A similar logic has discouraged us from advising “midtwentieth century”—though we do recommend “midcentury.”

How do you write the 16th century?

Generally speaking, 'century' should not be capitalised, so it always reads 'century' rather than 'Century'. The exception is when 'century' is used at the start of a sentence or in a proper noun (e.g. '20th Century Fox'). Finally, centuries can be abbreviated.