16566660 has 96 divisors (see below), whose sum is σ = 56246400. Its totient is φ = 4014720.

The previous prime is 16566637. The next prime is 16566691. The reversal of 16566660 is 6666561.

16566660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4546 + ... + 7334.

It is an arithmetic number, because the mean of its divisors is an integer number (585900).

Almost surely, 2^16566660 is an apocalyptic number.

16566660 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 16566660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28123200).

16566660 is an abundant number, since it is smaller than the sum of its proper divisors (39679740).

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

16566660 is a wasteful number, since it uses less digits than its factorization.

16566660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2818 (or 2810 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 16566660 is about 4070.2162104733. The cubic root of 16566660 is about 254.9245451491.

Subtracting from 16566660 its reverse (6666561), we obtain a palindrome (9900099).

The spelling of 16566660 in words is "sixteen million, five hundred sixty-six thousand, six hundred sixty".