The time complexity of the solution to print the kth least significant bit of a number is O(1). This is because the solution involves simple arithmetic operations and bit manipulation, which operate in constant time regardless of the size of the number. Whether the number is 8 bits, 32 bits, or 64 bits long, accessing the kth least significant bit can be done directly without iteration or any operations that scale with the size of the number. Therefore, the time complexity remains constant, denoted as O(1).