11556620556 has 48 divisors (see below), whose sum is σ = 29515798368. Its totient is φ = 3497587200.

The previous prime is 11556620489. The next prime is 11556620567. The reversal of 11556620556 is 65502665511.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 597705 + ... + 616736.

It is an arithmetic number, because the mean of its divisors is an integer number (614912466).

Almost surely, 2^11556620556 is an apocalyptic number.

It is an amenable number.

11556620556 is an abundant number, since it is smaller than the sum of its proper divisors (17959177812).

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

11556620556 is a wasteful number, since it uses less digits than its factorization.

11556620556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1214522 (or 1214520 counting only the distinct ones).

The product of its (nonzero) digits is 270000, while the sum is 42.

The spelling of 11556620556 in words is "eleven billion, five hundred fifty-six million, six hundred twenty thousand, five hundred fifty-six".