16804815917 has 4 divisors (see below), whose sum is σ = 16839899520. Its totient is φ = 16769732316.

The previous prime is 16804815901. The next prime is 16804815941. The reversal of 16804815917 is 71951840861.

It is a happy number.

16804815917 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16804815917 - 2⁴ = 16804815901 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 (16804815997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17541083 + ... + 17542040.

It is an arithmetic number, because the mean of its divisors is an integer number (4209974880).

Almost surely, 2^16804815917 is an apocalyptic number.

It is an amenable number.

16804815917 is a deficient number, since it is larger than the sum of its proper divisors (35083603).

16804815917 is an equidigital number, since it uses as much as digits as its factorization.

16804815917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35083602.

The product of its (nonzero) digits is 483840, while the sum is 50.

The spelling of 16804815917 in words is "sixteen billion, eight hundred four million, eight hundred fifteen thousand, nine hundred seventeen".