128572275821 has 4 divisors (see below), whose sum is σ = 140260664544. Its totient is φ = 116883887100.

The previous prime is 128572275803. The next prime is 128572275859.

128572275821 is nontrivially palindromic in base 10.

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.

It is a cyclic number.

It is not a de Polignac number, because 128572275821 - 2⁶ = 128572275757 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128572275821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128571275821) 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, 5844194345 + ... + 5844194366.

It is an arithmetic number, because the mean of its divisors is an integer number (35065166136).

Almost surely, 2^128572275821 is an apocalyptic number.

128572275821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

128572275821 is a deficient number, since it is larger than the sum of its proper divisors (11688388723).

128572275821 is a wasteful number, since it uses less digits than its factorization.

128572275821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11688388722.

The product of its digits is 1254400, while the sum is 50.

The spelling of 128572275821 in words is "one hundred twenty-eight billion, five hundred seventy-two million, two hundred seventy-five thousand, eight hundred twenty-one".