16644118611 has 4 divisors (see below), whose sum is σ = 22192158152. Its totient is φ = 11096079072.

The previous prime is 16644118607. The next prime is 16644118619. The reversal of 16644118611 is 11681144661.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 16644118611 - 2² = 16644118607 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 16644118611.

It is not an unprimeable number, because it can be changed into a prime (16644118619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2774019766 + ... + 2774019771.

It is an arithmetic number, because the mean of its divisors is an integer number (5548039538).

Almost surely, 2^16644118611 is an apocalyptic number.

16644118611 is a deficient number, since it is larger than the sum of its proper divisors (5548039541).

16644118611 is an equidigital number, since it uses as much as digits as its factorization.

16644118611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5548039540.

The product of its digits is 27648, while the sum is 39.

The spelling of 16644118611 in words is "sixteen billion, six hundred forty-four million, one hundred eighteen thousand, six hundred eleven".