16643109 has 8 divisors (see below), whose sum is σ = 25360960. Its totient is φ = 9510336.

The previous prime is 16643093. The next prime is 16643117. The reversal of 16643109 is 90134661.

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

It is not a de Polignac number, because 16643109 - 2⁴ = 16643093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16643189) 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, 396244 + ... + 396285.

It is an arithmetic number, because the mean of its divisors is an integer number (3170120).

Almost surely, 2^16643109 is an apocalyptic number.

It is an amenable number.

16643109 is a deficient number, since it is larger than the sum of its proper divisors (8717851).

16643109 is an equidigital number, since it uses as much as digits as its factorization.

16643109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792539.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 16643109 is about 4079.5966712409. The cubic root of 16643109 is about 255.3160709690.

The spelling of 16643109 in words is "sixteen million, six hundred forty-three thousand, one hundred nine".