16611980 has 144 divisors (see below), whose sum is σ = 46884096. Its totient is φ = 4878720.

The previous prime is 16611971. The next prime is 16611989. The reversal of 16611980 is 8911661.

It is an interprime number because it is at equal distance from previous prime (16611971) and next prime (16611989).

It is not an unprimeable number, because it can be changed into a prime (16611989) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 247907 + ... + 247973.

It is an arithmetic number, because the mean of its divisors is an integer number (325584).

Almost surely, 2^16611980 is an apocalyptic number.

16611980 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 16611980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23442048).

16611980 is an abundant number, since it is smaller than the sum of its proper divisors (30272116).

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

16611980 is a wasteful number, since it uses less digits than its factorization.

16611980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124 (or 115 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 16611980 is about 4075.7796800122. The cubic root of 16611980 is about 255.1567919498.

The spelling of 16611980 in words is "sixteen million, six hundred eleven thousand, nine hundred eighty".