(1) + (000000000000000) = 1
If it's actually "1 followed by 15 zeros" that you're looking for, that's "one quadrillion" (in American usage).
It's usually written "1 x 1015", and pronounced "one times ten to the fifteenth".
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x3 + x2 - 17x + 15 = (x - 1)(x - 3)(x + 5). Thus, the zeros are 1, 3, and -5. All three zeros are rational.
10,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000
One quadrillion = 1,000,000,000,000,000 = 1 × 1015, thus 15 zeros.
enneadecillion
18 zeros 1 million = 6 zeros 1 billion = 9 1 trillion = 12 1 quadrillion = 15 1 quintillion = 18 1 sextillion =21