111661661661 has 32 divisors (see below), whose sum is σ = 162921715200. Its totient is φ = 67463697600.

The previous prime is 111661661651. The next prime is 111661661669. The reversal of 111661661661 is 166166166111.

It is not a de Polignac number, because 111661661661 - 2⁶ = 111661661597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111661661669) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22642366 + ... + 22647296.

It is an arithmetic number, because the mean of its divisors is an integer number (5091303600).

Almost surely, 2^111661661661 is an apocalyptic number.

111661661661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111661661661 is a deficient number, since it is larger than the sum of its proper divisors (51260053539).

111661661661 is a wasteful number, since it uses less digits than its factorization.

111661661661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6937.

The product of its digits is 46656, while the sum is 42.

The spelling of 111661661661 in words is "one hundred eleven billion, six hundred sixty-one million, six hundred sixty-one thousand, six hundred sixty-one".