128668868512 has 24 divisors (see below), whose sum is σ = 254994439392. Its totient is φ = 63908376000.

The previous prime is 128668868479. The next prime is 128668868539. The reversal of 128668868512 is 215868866821.

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, 13309414 + ... + 13319077.

It is an arithmetic number, because the mean of its divisors is an integer number (10624768308).

Almost surely, 2^128668868512 is an apocalyptic number.

It is an amenable number.

128668868512 is a deficient number, since it is larger than the sum of its proper divisors (126325570880).

128668868512 is a wasteful number, since it uses less digits than its factorization.

128668868512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26628652 (or 26628644 counting only the distinct ones).

The product of its digits is 17694720, while the sum is 61.

The spelling of 128668868512 in words is "one hundred twenty-eight billion, six hundred sixty-eight million, eight hundred sixty-eight thousand, five hundred twelve".