128775148989 has 8 divisors (see below), whose sum is σ = 175353394560. Its totient is φ = 84023501376.

The previous prime is 128775148981. The next prime is 128775149011. The reversal of 128775148989 is 989841577821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128775148989 - 2³ = 128775148981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128775148981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 456649324 + ... + 456649605.

It is an arithmetic number, because the mean of its divisors is an integer number (21919174320).

Almost surely, 2^128775148989 is an apocalyptic number.

It is an amenable number.

128775148989 is a deficient number, since it is larger than the sum of its proper divisors (46578245571).

128775148989 is an equidigital number, since it uses as much as digits as its factorization.

128775148989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 913298979.

The product of its digits is 81285120, while the sum is 69.

The spelling of 128775148989 in words is "one hundred twenty-eight billion, seven hundred seventy-five million, one hundred forty-eight thousand, nine hundred eighty-nine".