128221501825 has 12 divisors (see below), whose sum is σ = 159023893248. Its totient is φ = 102558342800.

The previous prime is 128221501687. The next prime is 128221501829. The reversal of 128221501825 is 528105122821.

It is not a de Polignac number, because 128221501825 - 2⁹ = 128221501313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128221501829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 331957 + ... + 605506.

It is an arithmetic number, because the mean of its divisors is an integer number (13251991104).

Almost surely, 2^128221501825 is an apocalyptic number.

It is an amenable number.

128221501825 is a deficient number, since it is larger than the sum of its proper divisors (30802391423).

128221501825 is an equidigital number, since it uses as much as digits as its factorization.

128221501825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942944 (or 942939 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 37.

The spelling of 128221501825 in words is "one hundred twenty-eight billion, two hundred twenty-one million, five hundred one thousand, eight hundred twenty-five".