128183098721 has 4 divisors (see below), whose sum is σ = 128186439444. Its totient is φ = 128179758000.

The previous prime is 128183098661. The next prime is 128183098759. The reversal of 128183098721 is 127890381821.

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 51240660496 + 76942438225 = 226364^2 + 277385^2 .

It is a cyclic number.

It is not a de Polignac number, because 128183098721 - 2²⁶ = 128115989857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128183098721.

It is not an unprimeable number, because it can be changed into a prime (128183038721) 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, 1612130 + ... + 1689771.

It is an arithmetic number, because the mean of its divisors is an integer number (32046609861).

Almost surely, 2^128183098721 is an apocalyptic number.

It is an amenable number.

128183098721 is a deficient number, since it is larger than the sum of its proper divisors (3340723).

128183098721 is an equidigital number, since it uses as much as digits as its factorization.

128183098721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3340722.

The product of its (nonzero) digits is 387072, while the sum is 50.

The spelling of 128183098721 in words is "one hundred twenty-eight billion, one hundred eighty-three million, ninety-eight thousand, seven hundred twenty-one".