997
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The last prime number before 100 is 97
97
97
A balanced prime number is a prime number that is equal distance from the last prime before it and the next prime after it. Example: 53 is a balanced prime. The last prime number before it was 47 and the next prime after it is 59. (53 - 47) and (59 - 53) both equal 6, so 53 is a balanced prime.
The last prime before 400 is 397.The prime factorization of 400 is 2x2x2x2x5x5.