16728012907217 has 2 divisors, whose sum is σ = 16728012907218. Its totient is φ = 16728012907216.

The previous prime is 16728012907213. The next prime is 16728012907231. The reversal of 16728012907217 is 71270921082761.

16728012907217 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., 13542701761681 + 3185311145536 = 3680041^2 + 1784744^2 .

It is a cyclic number.

It is not a de Polignac number, because 16728012907217 - 2² = 16728012907213 is a prime.

It is not a weakly prime, because it can be changed into another prime (16728012907213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8364006453608 + 8364006453609.

It is an arithmetic number, because the mean of its divisors is an integer number (8364006453609).

Almost surely, 2^{16728012907217} is an apocalyptic number.

It is an amenable number.

16728012907217 is a deficient number, since it is larger than the sum of its proper divisors (1).

16728012907217 is an equidigital number, since it uses as much as digits as its factorization.

16728012907217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1185408, while the sum is 53.

Adding to 16728012907217 its reverse (71270921082761), we get a palindrome (87998933989978).

The spelling of 16728012907217 in words is "sixteen trillion, seven hundred twenty-eight billion, twelve million, nine hundred seven thousand, two hundred seventeen".