16661171666 has 8 divisors (see below), whose sum is σ = 25028350704. Its totient is φ = 8318388100.

The previous prime is 16661171663. The next prime is 16661171677. The reversal of 16661171666 is 66617116661.

16661171666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

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 16661171666.

It is not an unprimeable number, because it can be changed into a prime (16661171663) 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, 6097160 + ... + 6099891.

It is an arithmetic number, because the mean of its divisors is an integer number (3128543838).

Almost surely, 2^16661171666 is an apocalyptic number.

16661171666 is a deficient number, since it is larger than the sum of its proper divisors (8367179038).

16661171666 is a wasteful number, since it uses less digits than its factorization.

16661171666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12197736.

The product of its digits is 326592, while the sum is 47.

The spelling of 16661171666 in words is "sixteen billion, six hundred sixty-one million, one hundred seventy-one thousand, six hundred sixty-six".