128368516871 has 36 divisors (see below), whose sum is σ = 150999366672. Its totient is φ = 106901460864.

The previous prime is 128368516867. The next prime is 128368516891. The reversal of 128368516871 is 178615863821.

It is not a de Polignac number, because 128368516871 - 2² = 128368516867 is a prime.

It is a super-2 number, since 2×128368516871² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128368516831) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 216472751 + ... + 216473343.

It is an arithmetic number, because the mean of its divisors is an integer number (4194426852).

Almost surely, 2^128368516871 is an apocalyptic number.

128368516871 is a deficient number, since it is larger than the sum of its proper divisors (22630849801).

128368516871 is an frugal number, since it uses more digits than its factorization.

128368516871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 900 (or 750 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 56.

The spelling of 128368516871 in words is "one hundred twenty-eight billion, three hundred sixty-eight million, five hundred sixteen thousand, eight hundred seventy-one".