16904081881 has 2 divisors, whose sum is σ = 16904081882. Its totient is φ = 16904081880.

The previous prime is 16904081879. The next prime is 16904081939. The reversal of 16904081881 is 18818040961.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11942992656 + 4961089225 = 109284^2 + 70435^2 .

It is a cyclic number.

It is not a de Polignac number, because 16904081881 - 2¹ = 16904081879 is a prime.

It is a super-2 number, since 2×16904081881² (a number of 21 digits) contains 22 as substring.

Together with 16904081879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (16904081851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8452040940 + 8452040941.

It is an arithmetic number, because the mean of its divisors is an integer number (8452040941).

Almost surely, 2^16904081881 is an apocalyptic number.

It is an amenable number.

16904081881 is a deficient number, since it is larger than the sum of its proper divisors (1).

16904081881 is an equidigital number, since it uses as much as digits as its factorization.

16904081881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 110592, while the sum is 46.

The spelling of 16904081881 in words is "sixteen billion, nine hundred four million, eighty-one thousand, eight hundred eighty-one".