16804008891 has 12 divisors (see below), whose sum is σ = 24274383432. Its totient is φ = 11201783616.

The previous prime is 16804008889. The next prime is 16804008941. The reversal of 16804008891 is 19880040861.

16804008891 is a `hidden beast` number, since 1 + 6 + 80 + 400 + 88 + 91 = 666.

It is not a de Polignac number, because 16804008891 - 2¹ = 16804008889 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (16804008811) 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, 58035 + ... + 192291.

It is an arithmetic number, because the mean of its divisors is an integer number (2022865286).

Almost surely, 2^16804008891 is an apocalyptic number.

16804008891 is a deficient number, since it is larger than the sum of its proper divisors (7470374541).

16804008891 is a wasteful number, since it uses less digits than its factorization.

16804008891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148170 (or 148167 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 45.

The spelling of 16804008891 in words is "sixteen billion, eight hundred four million, eight thousand, eight hundred ninety-one".