128509619539 has 8 divisors (see below), whose sum is σ = 151932555360. Its totient is φ = 106352788416.

The previous prime is 128509619519. The next prime is 128509619561. The reversal of 128509619539 is 935916905821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128509619539 - 2⁹ = 128509619027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128509619519) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 316525954 + ... + 316526359.

It is an arithmetic number, because the mean of its divisors is an integer number (18991569420).

Almost surely, 2^128509619539 is an apocalyptic number.

128509619539 is a deficient number, since it is larger than the sum of its proper divisors (23422935821).

128509619539 is an equidigital number, since it uses as much as digits as its factorization.

128509619539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633052349.

The product of its (nonzero) digits is 5248800, while the sum is 58.

The spelling of 128509619539 in words is "one hundred twenty-eight billion, five hundred nine million, six hundred nineteen thousand, five hundred thirty-nine".