The number 180 is primarily known as the age at which Isaac died, and it also appears as the duration of King Ahasuerus' magnificent feast.
In Genesis 35:28 it is stated that Isaac lived for 180 years, which in biblical tradition represents a long and complete life under God's blessing. Isaac's lifespan underscores God's faithfulness to the patriarchs and the fulfillment of His promises to Abraham. In Esther 1:4 the number is used in a completely different context: King Ahasuerus held a feast that lasted for 180 days, during which he displayed the wealth of his royal splendor and the magnificence of his greatness. While Isaac's 180 years testify to a quiet life under God's faithful care, Ahasuerus' 180 days illustrate human pride and worldly displays of power – a contrast that gives the number rich symbolic breadth in Scripture. The number 180 can be seen as the product of 18 × 10. In Jewish gematria, 18 has the value of the word 'chai' (חי), which means 'life', while 10 symbolizes divine perfection. Isaac's 180 years of life can thus be read as 'the fullness of life in divine perfection'. Rabbinic commentators have noted that Isaac lived longer than the three patriarchs after Abraham (who was 175) and Jacob (who was 147). Isaac's long lifespan is interpreted as a sign that God rewarded his obedience, especially at the Akedah (the binding on Mount Moriah). The 180 days in Esther 1:4 have been interpreted by historians as a period during which Ahasuerus (identified with Xerxes I) planned his campaign against Greece. The feast thus served both as a demonstration of power and military mobilization.*