128109834065 has 16 divisors (see below), whose sum is σ = 159619783680. Its totient is φ = 98588629440.

The previous prime is 128109834053. The next prime is 128109834067. The reversal of 128109834065 is 560438901821.

It is a happy number.

It is not a de Polignac number, because 128109834065 - 2⁴ = 128109834049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128109834067) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1590809 + ... + 1669398.

It is an arithmetic number, because the mean of its divisors is an integer number (9976236480).

Almost surely, 2^128109834065 is an apocalyptic number.

It is an amenable number.

128109834065 is a deficient number, since it is larger than the sum of its proper divisors (31509949615).

128109834065 is a wasteful number, since it uses less digits than its factorization.

128109834065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3260512.

The product of its (nonzero) digits is 414720, while the sum is 47.

The spelling of 128109834065 in words is "one hundred twenty-eight billion, one hundred nine million, eight hundred thirty-four thousand, sixty-five".