16689441617 has 2 divisors, whose sum is σ = 16689441618. Its totient is φ = 16689441616.

The previous prime is 16689441577. The next prime is 16689441647. The reversal of 16689441617 is 71614498661.

16689441617 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., 15188344081 + 1501097536 = 123241^2 + 38744^2 .

It is a cyclic number.

It is not a de Polignac number, because 16689441617 - 2⁸ = 16689441361 is a prime.

It is a super-2 number, since 2×16689441617² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16689441647) 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, 8344720808 + 8344720809.

It is an arithmetic number, because the mean of its divisors is an integer number (8344720809).

Almost surely, 2^16689441617 is an apocalyptic number.

It is an amenable number.

16689441617 is a deficient number, since it is larger than the sum of its proper divisors (1).

16689441617 is an equidigital number, since it uses as much as digits as its factorization.

16689441617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1741824, while the sum is 53.

The spelling of 16689441617 in words is "sixteen billion, six hundred eighty-nine million, four hundred forty-one thousand, six hundred seventeen".