16556109 has 8 divisors (see below), whose sum is σ = 22354560. Its totient is φ = 10897536.

The previous prime is 16556107. The next prime is 16556123. The reversal of 16556109 is 90165561.

16556109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16556109 - 2¹ = 16556107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16556109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16556107) 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, 34692 + ... + 35165.

It is an arithmetic number, because the mean of its divisors is an integer number (2794320).

Almost surely, 2^16556109 is an apocalyptic number.

It is an amenable number.

16556109 is a deficient number, since it is larger than the sum of its proper divisors (5798451).

16556109 is an equidigital number, since it uses as much as digits as its factorization.

16556109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69939.

The product of its (nonzero) digits is 8100, while the sum is 33.

The square root of 16556109 is about 4068.9198812461. The cubic root of 16556109 is about 254.8704147432.

The spelling of 16556109 in words is "sixteen million, five hundred fifty-six thousand, one hundred nine".