25643985470955911102
This number is a composite.
2564398547 0955911102
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The only known multidigit nonprime solution n to the Subbarao's congruence ϕ(n) × tau(n) + 2 == 0 (mod n), a property trivially satisfied by all primes. Here, ϕ(n) refers to the totient function and tau(n) refers to the
number of divisors. [Gudipati]
Submitted: 2026-06-06 04:55:36; Last Modified: 2026-06-06 11:34:46.
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