2. 3, 4 and 5 make up a number. Each number can only be used once. What is the largest number? (hint: power operation is allowed, and 5432,42 ^ 53. Please use "^" for power calculation, such as 2 ^ 8 for the 8th power of 2.)

2. 3, 4 and 5 make up a number. Each number can only be used once. What is the largest number? (hint: power operation is allowed, and 5432,42 ^ 53. Please use "^" for power calculation, such as 2 ^ 8 for the 8th power of 2.)

(3^2)^4]^5
=3^40
=12157665459056928801