To simplify the given expression, let's break it down step by step:

Step 1: Simplify the innermost parentheses.
39/65 + 0.415 - 33/600 = 39/65 + 0.415 - 11/200 = (39/65 + 0.415 * 200/200 - 11/200) = (39/65 + 83/200 - 11/200) = (39/65 + 83 - 11)/200 = (39/65 + 72)/200 = (39 + 72 * 65)/200 = (39 + 4680)/200 = 4719/200

Step 2: Simplify the next set of parentheses.
[4719/200]/7^2 - 18.25 + 161/12 - 1649/102 = (4719/200)/49 - 18.25 + 161/12 - 1649/102 = (4719/200) * (1/49) - 18.25 + 161/12 - 1649/102 = 4719/9800 - 18.25 + 161/12 - 1649/102

Step 3: Find a common denominator for the fractions.
The common denominator for 9800, 12, and 102 is 122400.

Step 4: Convert all fractions to have the common denominator.
4719/9800 - 18.25 + 161/12 - 1649/102 = (4719/9800) * (12/12) - (18.25 * 122400/122400) + (161/12) * (10200/10200) - (1649/102) * (1200/1200)
= 56628/117600 - 222900/122400 + 194520/122400 - 1978800/122400

Step 5: Combine like terms.
56628/117600 - 222900/122400 + 194520/122400 - 1978800/122400 = (56628 - 222900 + 194520 - 1978800)/122400
= (-1571552)/122400

Step 6: Simplify the fraction.
-1571552/122400 = -1571552 ÷ 122400 = -12.84

Therefore, the simplified expression is -12.84.