16500111115561 has 8 divisors (see below), whose sum is σ = 17696246281920. Its totient is φ = 15336746775792.

The previous prime is 16500111115541. The next prime is 16500111115573. The reversal of 16500111115561 is 16551111100561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16500111115561 - 2⁵ = 16500111115529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16500111115541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8192705605 + ... + 8192707618.

It is an arithmetic number, because the mean of its divisors is an integer number (2212030785240).

Almost surely, 2^{16500111115561} is an apocalyptic number.

It is an amenable number.

16500111115561 is a deficient number, since it is larger than the sum of its proper divisors (1196135166359).

16500111115561 is a wasteful number, since it uses less digits than its factorization.

16500111115561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16385413295.

The product of its (nonzero) digits is 4500, while the sum is 34.

The spelling of 16500111115561 in words is "sixteen trillion, five hundred billion, one hundred eleven million, one hundred fifteen thousand, five hundred sixty-one".