16653109 has 12 divisors (see below), whose sum is σ = 18415180. Its totient is φ = 15048000.

The previous prime is 16653103. The next prime is 16653137. The reversal of 16653109 is 90135661.

It can be written as a sum of positive squares in 2 ways, for example, as 14822500 + 1830609 = 3850^2 + 1353^2 .

It is not a de Polignac number, because 16653109 - 2¹⁹ = 16128821 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 (16653103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27409 + ... + 28009.

Almost surely, 2^16653109 is an apocalyptic number.

It is an amenable number.

16653109 is a deficient number, since it is larger than the sum of its proper divisors (1762071).

16653109 is a wasteful number, since it uses less digits than its factorization.

16653109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852 (or 841 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 16653109 is about 4080.8220985483. The cubic root of 16653109 is about 255.3671962230.

It can be divided in two parts, 1665 and 3109, that added together give a palindrome (4774).

The spelling of 16653109 in words is "sixteen million, six hundred fifty-three thousand, one hundred nine".