11505105656 has 16 divisors (see below), whose sum is σ = 23533170840. Its totient is φ = 5229593440.

The previous prime is 11505105643. The next prime is 11505105679. The reversal of 11505105656 is 65650150511.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65369831 + ... + 65370006.

Almost surely, 2^11505105656 is an apocalyptic number.

It is an amenable number.

11505105656 is an abundant number, since it is smaller than the sum of its proper divisors (12028065184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11505105656 is a wasteful number, since it uses less digits than its factorization.

11505105656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130739854 (or 130739850 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 35.

The spelling of 11505105656 in words is "eleven billion, five hundred five million, one hundred five thousand, six hundred fifty-six".