16661171660 has 96 divisors (see below), whose sum is σ = 40740779520. Its totient is φ = 5605060608.

The previous prime is 16661171647. The next prime is 16661171663. The reversal of 16661171660 is 6617116661.

16661171660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 31 ways as a sum of consecutive naturals, for example, 5309612 + ... + 5312748.

It is an arithmetic number, because the mean of its divisors is an integer number (424383120).

Almost surely, 2^16661171660 is an apocalyptic number.

16661171660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16661171660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20370389760).

16661171660 is an abundant number, since it is smaller than the sum of its proper divisors (24079607860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16661171660 is a wasteful number, since it uses less digits than its factorization.

16661171660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3855 (or 3853 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 41.

The spelling of 16661171660 in words is "sixteen billion, six hundred sixty-one million, one hundred seventy-one thousand, six hundred sixty".