128226256865 has 24 divisors (see below), whose sum is σ = 179742395520. Its totient is φ = 87558642528.

The previous prime is 128226256853. The next prime is 128226256871. The reversal of 128226256865 is 568652622821.

It is not a de Polignac number, because 128226256865 - 2¹² = 128226252769 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1036367 + ... + 1153476.

It is an arithmetic number, because the mean of its divisors is an integer number (7489266480).

Almost surely, 2^128226256865 is an apocalyptic number.

It is an amenable number.

128226256865 is a deficient number, since it is larger than the sum of its proper divisors (51516138655).

128226256865 is a wasteful number, since it uses less digits than its factorization.

128226256865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2190101 (or 2190094 counting only the distinct ones).

The product of its digits is 5529600, while the sum is 53.

The spelling of 128226256865 in words is "one hundred twenty-eight billion, two hundred twenty-six million, two hundred fifty-six thousand, eight hundred sixty-five".