A simple cipher used in a Japanese TV series is described in a new article in Japanese 「ハードナッツ」の暗号（素因数分解指数暗号）. It is basically simple substitution, but involves an additional layer of factorization/exponentiation. Try to decipher the following:
110487239481514742664955700062500000.
The key is written below in white, which you can see by selecting.
Factor the ciphertext:
110487239481514742664955700062500000=2^5*3^14*5^9*7^7*11^13*13^1
(It was interesting to see that AI failed in this simple task.)
The exponents represent letters in the alphabet:
5(E) 14(N) 9(I) 7(G) 13(M) 1(A).
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