16661199011 has 4 divisors (see below), whose sum is σ = 17385598992. Its totient is φ = 15936799032.

The previous prime is 16661198947. The next prime is 16661199013. The reversal of 16661199011 is 11099116661.

16661199011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11099116661 = 3257 ⋅3407773.

It is a cyclic number.

It is not a de Polignac number, because 16661199011 - 2⁶ = 16661198947 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16661199011.

It is not an unprimeable number, because it can be changed into a prime (16661199013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362199956 + ... + 362200001.

It is an arithmetic number, because the mean of its divisors is an integer number (4346399748).

Almost surely, 2^16661199011 is an apocalyptic number.

16661199011 is a deficient number, since it is larger than the sum of its proper divisors (724399981).

16661199011 is an equidigital number, since it uses as much as digits as its factorization.

16661199011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724399980.

The product of its (nonzero) digits is 17496, while the sum is 41.

The spelling of 16661199011 in words is "sixteen billion, six hundred sixty-one million, one hundred ninety-nine thousand, eleven".