Find a constant $ c > 1$ with the property that, for arbitrary positive integers $ n$ and $ k$ such that $ n>c^k$, the number of distinct prime factors of $ \binom{n}{k}$ is at least $ k$. 

[i]P. Erdos[/i]
To find a constant \( c > 1 \) such that for arbitrary positive integers \( n \) and \( k \) with \( n > c^k \), the number of distinct prime factors of \( \binom{n}{k} \) is at least \( k \), we proceed as follows:

1. **Prime Numbers Less Than \( k \)**:
   Let \( p_1 < p_2 < \cdots < p_\ell \) be the prime numbers less than \( k \), where \( \ell = \pi(k-1) \) and \( \pi(x) \) is the prime-counting function, which gives the number of primes less than or equal to \( x \).

2. **Prime Factors of \( n - i \)**:
   Consider \( n - i \) for \( 0 \le i \le k-1 \). If \( n - i \) has a prime factor \( p \ge k \), then \( \gcd(p, n - j) = 1 \) for all \( 0 \le j \ne i \le k-1 \). This means for each such \( i \), we can get distinct prime factors no less than \( k \).

3. **Prime Divisors Less Than \( k \)**:
   Suppose \( n - i_j = p_1^{\alpha_j(1)} p_2^{\alpha_j(2)} \cdots p_\ell^{\alpha_j(\ell)} \) for \( 0 \le i_1 < i_2 < \cdots < i_m \le k-1 \) only have prime divisors less than \( k \).

4. **Bounding \( m \)**:
   If \( m > \ell \), then by the Pigeonhole Principle, there must be some \( j \) for which \( p_i^{\alpha_j(i)} < k \) for all \( 1 \le i \le \ell \). Since \( \gcd(n - i_r, n - i_s) < k \) for all \( 1 \le r \ne s \le m \), we have:
   \[
   c^k - k + 1 < n - k + 1 \le n - i_j < k^\ell \le k^{\pi(k-1)} < k^{\frac{Ck}{\ln(k)}} = e^{Ck}
   \]
   for some constant \( C \) independent of \( k \) (by the Prime Number Theorem, PNT). This inequality is false for sufficiently large \( c \).

5. **Conclusion for \( m \le \ell \)**:
   Thus, \( m \le \ell \). Using similar logic, the largest prime powers dividing \( n - i_1, \ldots, n - i_m \) are pairwise relatively prime. Suppose \( q^r \) is the largest prime power dividing \( n - i_j \), then:
   \[
   q^r \ge \sqrt[\ell]{n - i_j} \ge \sqrt[\pi(k-1)]{n - k + 1} > n^{\frac{\ln(k)}{C'k}} > c^{\frac{\ln(k)}{C'}} > k
   \]
   for sufficiently large \( c \) (where \( C' \) is another constant independent of \( k \) determined by the PNT).

6. **Valuation of \( q \) in \( \binom{n}{k} \)**:
   Then,
   \[
   v_q\left(\binom{n}{k}\right) = \sum_{s \ge 0} \left\lfloor \frac{n}{q^s} \right\rfloor - \left\lfloor \frac{k}{q^s} \right\rfloor - \left\lfloor \frac{n - k}{q^s} \right\rfloor \ge \left\lfloor \frac{n}{q^r} \right\rfloor - \left\lfloor \frac{k}{q^r} \right\rfloor - \left\lfloor \frac{n - k}{q^r} \right\rfloor = 1
   \]
   (note that \( q^r > k \) and \( n - k < n - i_j \le n \)), where we have used the fact that:
   \[
   0 \le \lfloor a + b \rfloor - \lfloor a \rfloor - \lfloor b \rfloor \le 1
   \]
   for all reals \( a, b \).

7. **Conclusion**:
   Hence, we have at least \( (k - m) + m = k \) prime factors, as desired.

The final answer is \( \boxed{ c } \) such that \( c > 1 \) and sufficiently large to satisfy the conditions above.