128576735509 has 4 divisors (see below), whose sum is σ = 128578121740. Its totient is φ = 128575349280.

The previous prime is 128576735503. The next prime is 128576735513. The reversal of 128576735509 is 905537675821.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 39606970225 + 88969765284 = 199015^2 + 298278^2 .

It is a cyclic number.

It is not a de Polignac number, because 128576735509 - 2¹⁷ = 128576604437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128576735503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 543174 + ... + 743095.

It is an arithmetic number, because the mean of its divisors is an integer number (32144530435).

Almost surely, 2^128576735509 is an apocalyptic number.

It is an amenable number.

128576735509 is a deficient number, since it is larger than the sum of its proper divisors (1386231).

128576735509 is an equidigital number, since it uses as much as digits as its factorization.

128576735509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1386230.

The product of its (nonzero) digits is 15876000, while the sum is 58.

The spelling of 128576735509 in words is "one hundred twenty-eight billion, five hundred seventy-six million, seven hundred thirty-five thousand, five hundred nine".