16804942981 has 2 divisors, whose sum is σ = 16804942982. Its totient is φ = 16804942980.

The previous prime is 16804942949. The next prime is 16804942993. The reversal of 16804942981 is 18924940861.

16804942981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11959390881 + 4845552100 = 109359^2 + 69610^2 .

It is a cyclic number.

It is not a de Polignac number, because 16804942981 - 2⁵ = 16804942949 is a prime.

It is a super-2 number, since 2×16804942981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16804942181) 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 as a sum of consecutive naturals, namely, 8402471490 + 8402471491.

It is an arithmetic number, because the mean of its divisors is an integer number (8402471491).

Almost surely, 2^16804942981 is an apocalyptic number.

It is an amenable number.

16804942981 is a deficient number, since it is larger than the sum of its proper divisors (1).

16804942981 is an equidigital number, since it uses as much as digits as its factorization.

16804942981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 995328, while the sum is 52.

The spelling of 16804942981 in words is "sixteen billion, eight hundred four million, nine hundred forty-two thousand, nine hundred eighty-one".