4⁶¹ + 4⁶⁴ + 4⁶⁵ = 4⁶¹ (1 + 4³ + 4⁴)
... = 4⁶¹ (1 + 64 + 256)
... = 4⁶¹ • 321
... = 4⁶¹ • 3 • 107
So it's divisible by 4, 3, and 107, in addition to any combination of these divisors.
