16556660 has 12 divisors (see below), whose sum is σ = 34769028. Its totient is φ = 6622656.

The previous prime is 16556641. The next prime is 16556663. The reversal of 16556660 is 6665561.

It can be written as a sum of positive squares in 2 ways, for example, as 12138256 + 4418404 = 3484^2 + 2102^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 16556660.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16556663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 413897 + ... + 413936.

It is an arithmetic number, because the mean of its divisors is an integer number (2897419).

Almost surely, 2^16556660 is an apocalyptic number.

16556660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16556660 is an abundant number, since it is smaller than the sum of its proper divisors (18212368).

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

16556660 is a wasteful number, since it uses less digits than its factorization.

16556660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827842 (or 827840 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 16556660 is about 4068.9875890693. The cubic root of 16556660 is about 254.8732421395.

The spelling of 16556660 in words is "sixteen million, five hundred fifty-six thousand, six hundred sixty".