1328720657168 has 20 divisors (see below), whose sum is σ = 2574737081280. Its totient is φ = 664272378144.

The previous prime is 1328720657153. The next prime is 1328720657189. The reversal of 1328720657168 is 8617560278231.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5372180 + ... + 5614067.

It is an arithmetic number, because the mean of its divisors is an integer number (128736854064).

Almost surely, 2^{1328720657168} is an apocalyptic number.

It is an amenable number.

1328720657168 is a deficient number, since it is larger than the sum of its proper divisors (1246016424112).

1328720657168 is a wasteful number, since it uses less digits than its factorization.

1328720657168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10993814 (or 10993808 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 56.

The spelling of 1328720657168 in words is "one trillion, three hundred twenty-eight billion, seven hundred twenty million, six hundred fifty-seven thousand, one hundred sixty-eight".