27559 is a member of OEIS A046528: numbers that are a product of distinct Mersenne primes (3, 7, 31, 127, 8191 etc.). the sequence can be generated as follows (permalink):

INPUT

M=[2^n-1 for n in [1..14] if is_prime(2^n-1)]

print(M)

S=Subsets(Set(M))

L=[]

for s in S:

  if prod(s)<40000:

    L.append(prod(s))

print(sorted(Set(L)))

OUTPUT

[3, 7, 31, 127, 8191]

[1, 3, 7, 21, 31, 93, 127, 217, 381, 651, 889, 2667, 3937, 8191, 11811, 24573, 27559]

27559 is a sphenic and Duffinian number.

27559 is a Zeisel number with parameters (4, 3). Starting with 1, a new number is formed from 4 * 1 + 3 = 7. This is prime so it is used as our new input to form the next number which is 4 * 7 + 3 = 31. This is also prime so we proceed using 31 as the new input. This generates 4 * 31 + 3 = 127 which is prime and this sequence of prime numbers (7, 31 and 127) can thus form a Zeisel number: 7 * 31 * 127 = 27559. The input 127 does not produce a prime number and so no further Zeisel numbers can be formed using (4, 3) as inputs. Of course, the primes 7, 31 and 127 are also consecutive Mersenne primes.