666666:66;87;6

I’m not sure what you want to do with "666666:66;87;6". Could you share the full problem or explain the goal? Here are a couple plausible interpretations and quick results:

• If you want to simplify the ratio 666666:66:

  • gcd(666666, 66) = 66
  • 666666:66 simplifies to 10101:1 (i.e., 10101)

• If you’re asking whether 666666:66 equals 87:6 as a proportion:

  • Check by cross-multiplication: 666666 × 6 = 3,999,996
  • 66 × 87 = 5,742
  • Since 3,999,996 ≠ 5,742, the proportion 666666:66 = 87:6 is false.

If you intended a different problem (e.g., a puzzle, a sequence, or you want a gcd/lcm calculation involving these numbers), please provide the exact statement or context and I’ll solve it step by step.