16544454089 has 2 divisors, whose sum is σ = 16544454090. Its totient is φ = 16544454088.

The previous prime is 16544454037. The next prime is 16544454107. The reversal of 16544454089 is 98045444561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12824430025 + 3720024064 = 113245^2 + 60992^2 .

It is a cyclic number.

It is not a de Polignac number, because 16544454089 - 2⁸ = 16544453833 is a prime.

It is a super-2 number, since 2×16544454089² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (16544454019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8272227044 + 8272227045.

It is an arithmetic number, because the mean of its divisors is an integer number (8272227045).

Almost surely, 2^16544454089 is an apocalyptic number.

It is an amenable number.

16544454089 is a deficient number, since it is larger than the sum of its proper divisors (1).

16544454089 is an equidigital number, since it uses as much as digits as its factorization.

16544454089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2764800, while the sum is 50.

The spelling of 16544454089 in words is "sixteen billion, five hundred forty-four million, four hundred fifty-four thousand, eighty-nine".