128573957569 has 4 divisors (see below), whose sum is σ = 128574814896. Its totient is φ = 128573100244.

The previous prime is 128573957557. The next prime is 128573957579. The reversal of 128573957569 is 965759375821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 128573957569 - 2⁷ = 128573957441 is a prime.

It is a super-2 number, since 2×128573957569² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128573957579) 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 3 ways as a sum of consecutive naturals, for example, 138019 + ... + 525544.

It is an arithmetic number, because the mean of its divisors is an integer number (32143703724).

Almost surely, 2^128573957569 is an apocalyptic number.

It is an amenable number.

128573957569 is a deficient number, since it is larger than the sum of its proper divisors (857327).

128573957569 is an equidigital number, since it uses as much as digits as its factorization.

128573957569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857326.

The product of its digits is 142884000, while the sum is 67.

The spelling of 128573957569 in words is "one hundred twenty-eight billion, five hundred seventy-three million, nine hundred fifty-seven thousand, five hundred sixty-nine".