1111100111556 has 48 divisors (see below), whose sum is σ = 2632186167744. Its totient is φ = 364735328256.

The previous prime is 1111100111551. The next prime is 1111100111591. The reversal of 1111100111556 is 6551110011111.

It is a happy number.

It is a super-2 number, since 2×1111100111556² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1111100111551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1470301 + ... + 2093796.

It is an arithmetic number, because the mean of its divisors is an integer number (54837211828).

Almost surely, 2^{1111100111556} is an apocalyptic number.

It is an amenable number.

1111100111556 is an abundant number, since it is smaller than the sum of its proper divisors (1521086056188).

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

1111100111556 is a wasteful number, since it uses less digits than its factorization.

1111100111556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3564500 (or 3564498 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 24.

Adding to 1111100111556 its reverse (6551110011111), we get a palindrome (7662210122667).

The spelling of 1111100111556 in words is "one trillion, one hundred eleven billion, one hundred million, one hundred eleven thousand, five hundred fifty-six".