16904816389 has 4 divisors (see below), whose sum is σ = 16908537100. Its totient is φ = 16901095680.

The previous prime is 16904816381. The next prime is 16904816399. The reversal of 16904816389 is 98361840961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98361840961 = 157351 ⋅625111.

It can be written as a sum of positive squares in 2 ways, for example, as 6695330625 + 10209485764 = 81825^2 + 101042^2 .

It is a cyclic number.

It is not a de Polignac number, because 16904816389 - 2³ = 16904816381 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 (16904816381) 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 3 ways as a sum of consecutive naturals, for example, 1853532 + ... + 1862629.

It is an arithmetic number, because the mean of its divisors is an integer number (4227134275).

Almost surely, 2^16904816389 is an apocalyptic number.

It is an amenable number.

16904816389 is a deficient number, since it is larger than the sum of its proper divisors (3720711).

16904816389 is an equidigital number, since it uses as much as digits as its factorization.

16904816389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3720710.

The product of its (nonzero) digits is 2239488, while the sum is 55.

The spelling of 16904816389 in words is "sixteen billion, nine hundred four million, eight hundred sixteen thousand, three hundred eighty-nine".