16890175809 has 20 divisors (see below), whose sum is σ = 27171851476. Its totient is φ = 10393953696.

The previous prime is 16890175807. The next prime is 16890175823. The reversal of 16890175809 is 90857109861.

It can be written as a sum of positive squares in 2 ways, for example, as 8803130625 + 8087045184 = 93825^2 + 89928^2 .

It is not a de Polignac number, because 16890175809 - 2¹ = 16890175807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16890175807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 8018974 + ... + 8021079.

Almost surely, 2^16890175809 is an apocalyptic number.

It is an amenable number.

16890175809 is a deficient number, since it is larger than the sum of its proper divisors (10281675667).

16890175809 is a wasteful number, since it uses less digits than its factorization.

16890175809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16040078 (or 16040069 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 54.

The spelling of 16890175809 in words is "sixteen billion, eight hundred ninety million, one hundred seventy-five thousand, eight hundred nine".