16446178549 has 2 divisors, whose sum is σ = 16446178550. Its totient is φ = 16446178548.

The previous prime is 16446178501. The next prime is 16446178613. The reversal of 16446178549 is 94587164461.

16446178549 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15477101649 + 969076900 = 124407^2 + 31130^2 .

It is a cyclic number.

It is not a de Polignac number, because 16446178549 - 2⁷ = 16446178421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16446178549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16446178849) 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, 8223089274 + 8223089275.

It is an arithmetic number, because the mean of its divisors is an integer number (8223089275).

Almost surely, 2^16446178549 is an apocalyptic number.

It is an amenable number.

16446178549 is a deficient number, since it is larger than the sum of its proper divisors (1).

16446178549 is an equidigital number, since it uses as much as digits as its factorization.

16446178549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5806080, while the sum is 55.

The spelling of 16446178549 in words is "sixteen billion, four hundred forty-six million, one hundred seventy-eight thousand, five hundred forty-nine".