The specifications are such that you cannot enter anything other than an integer, and although you can enter any number of digits, only integers with 18 digits or less can be judged. If there is a leading 0, it will be removed from the judgment.
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For you who cannot help factoring into prime factors when you see a large number. You can factor up to 18 digits at high speed. It has a simple and easy-to-read design, and there are no annoying advertisements.