11111561656 has 16 divisors (see below), whose sum is σ = 22436807400. Its totient is φ = 5128413024.

The previous prime is 11111561653. The next prime is 11111561683. The reversal of 11111561656 is 65616511111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111561653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53420866 + ... + 53421073.

Almost surely, 2^11111561656 is an apocalyptic number.

It is an amenable number.

11111561656 is an abundant number, since it is smaller than the sum of its proper divisors (11325245744).

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

11111561656 is a wasteful number, since it uses less digits than its factorization.

11111561656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106841958 (or 106841954 counting only the distinct ones).

The product of its digits is 5400, while the sum is 34.

The spelling of 11111561656 in words is "eleven billion, one hundred eleven million, five hundred sixty-one thousand, six hundred fifty-six".