There is a prime number whose reciprocal has a 1 followed by 24 zeros in its decimal expansion. - Apparently.
The prime number is 13,459,178,261. Its reciprocal, 1/13,459,178,261, has a 1 followed by 24 zeros in its decimal expansion. This property was discovered in 1999 by a mathematician named Robert Baillie, who used a computer to search for such prime numbers.