16661120 has 64 divisors (see below), whose sum is σ = 45532800. Its totient is φ = 5710848.

The previous prime is 16661107. The next prime is 16661123. The reversal of 16661120 is 2116661.

16661120 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (16661123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2621 + ... + 6339.

It is an arithmetic number, because the mean of its divisors is an integer number (711450).

Almost surely, 2^16661120 is an apocalyptic number.

16661120 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 16661120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22766400).

16661120 is an abundant number, since it is smaller than the sum of its proper divisors (28871680).

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

16661120 is an equidigital number, since it uses as much as digits as its factorization.

16661120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3745 (or 3733 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 16661120 is about 4081.8035229540. The cubic root of 16661120 is about 255.4081379006.

Adding to 16661120 its reverse (2116661), we get a palindrome (18777781).

The spelling of 16661120 in words is "sixteen million, six hundred sixty-one thousand, one hundred twenty".