128917465656 has 32 divisors (see below), whose sum is σ = 368335616640. Its totient is φ = 36833561568.

The previous prime is 128917465597. The next prime is 128917465711. The reversal of 128917465656 is 656564719821.

It is a self number, because there is not a number n which added to its sum of digits gives 128917465656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 383682766 + ... + 383683101.

It is an arithmetic number, because the mean of its divisors is an integer number (11510488020).

Almost surely, 2^128917465656 is an apocalyptic number.

It is an amenable number.

128917465656 is an abundant number, since it is smaller than the sum of its proper divisors (239418150984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128917465656 is a wasteful number, since it uses less digits than its factorization.

128917465656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767365883 (or 767365879 counting only the distinct ones).

The product of its digits is 21772800, while the sum is 60.

The spelling of 128917465656 in words is "one hundred twenty-eight billion, nine hundred seventeen million, four hundred sixty-five thousand, six hundred fifty-six".