111655556661 has 64 divisors (see below), whose sum is σ = 171435398400. Its totient is φ = 64017408000.

The previous prime is 111655556651. The next prime is 111655556669. The reversal of 111655556661 is 166655556111.

It is not a de Polignac number, because 111655556661 - 2⁹ = 111655556149 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 111655556661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111655556669) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9369775 + ... + 9381683.

It is an arithmetic number, because the mean of its divisors is an integer number (2678678100).

Almost surely, 2^111655556661 is an apocalyptic number.

111655556661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111655556661 is a deficient number, since it is larger than the sum of its proper divisors (59779841739).

111655556661 is a wasteful number, since it uses less digits than its factorization.

111655556661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12150.

The product of its digits is 810000, while the sum is 48.

The spelling of 111655556661 in words is "one hundred eleven billion, six hundred fifty-five million, five hundred fifty-six thousand, six hundred sixty-one".