16908128257 has 4 divisors (see below), whose sum is σ = 16919546436. Its totient is φ = 16896710080.

The previous prime is 16908128249. The next prime is 16908128261. The reversal of 16908128257 is 75282180961.

It is a happy number.

16908128257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75282180961 = 13 ⋅5790936997.

It can be written as a sum of positive squares in 2 ways, for example, as 13441156096 + 3466972161 = 115936^2 + 58881^2 .

It is a cyclic number.

It is not a de Polignac number, because 16908128257 - 2³ = 16908128249 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16908128257.

It is not an unprimeable number, because it can be changed into a prime (16908138257) 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 in 3 ways as a sum of consecutive naturals, for example, 5706868 + ... + 5709829.

It is an arithmetic number, because the mean of its divisors is an integer number (4229886609).

Almost surely, 2^16908128257 is an apocalyptic number.

It is an amenable number.

16908128257 is a deficient number, since it is larger than the sum of its proper divisors (11418179).

16908128257 is a wasteful number, since it uses less digits than its factorization.

16908128257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11418178.

The product of its (nonzero) digits is 483840, while the sum is 49.

The spelling of 16908128257 in words is "sixteen billion, nine hundred eight million, one hundred twenty-eight thousand, two hundred fifty-seven".