128271238065 has 64 divisors (see below), whose sum is σ = 241539045120. Its totient is φ = 64363852800.

The previous prime is 128271237989. The next prime is 128271238087. The reversal of 128271238065 is 560832172821.

It is not a de Polignac number, because 128271238065 - 2⁷ = 128271237937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 128271238065.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7581115 + ... + 7598015.

It is an arithmetic number, because the mean of its divisors is an integer number (3774047580).

Almost surely, 2^128271238065 is an apocalyptic number.

128271238065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128271238065 is a deficient number, since it is larger than the sum of its proper divisors (113267807055).

128271238065 is a wasteful number, since it uses less digits than its factorization.

128271238065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20239 (or 20233 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The spelling of 128271238065 in words is "one hundred twenty-eight billion, two hundred seventy-one million, two hundred thirty-eight thousand, sixty-five".