128534428942529 has 4 divisors (see below), whose sum is σ = 131669415014340. Its totient is φ = 125399442870720.

The previous prime is 128534428942511. The next prime is 128534428942531. The reversal of 128534428942529 is 925249824435821.

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 15140192281600 + 113394236660929 = 3891040^2 + 10648673^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128534428942529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128534428942589) 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, 1567493035844 + ... + 1567493035925.

It is an arithmetic number, because the mean of its divisors is an integer number (32917353753585).

Almost surely, 2^{128534428942529} is an apocalyptic number.

It is an amenable number.

128534428942529 is a deficient number, since it is larger than the sum of its proper divisors (3134986071811).

128534428942529 is an equidigital number, since it uses as much as digits as its factorization.

128534428942529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3134986071810.

The product of its digits is 398131200, while the sum is 68.

The spelling of 128534428942529 in words is "one hundred twenty-eight trillion, five hundred thirty-four billion, four hundred twenty-eight million, nine hundred forty-two thousand, five hundred twenty-nine".