128608155785 has 8 divisors (see below), whose sum is σ = 154361961096. Its totient is φ = 102865075200.

The previous prime is 128608155721. The next prime is 128608155817. The reversal of 128608155785 is 587551806821.

It can be written as a sum of positive squares in 4 ways, for example, as 3023680144 + 125584475641 = 54988^2 + 354379^2 .

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

It is not a de Polignac number, because 128608155785 - 2⁶ = 128608155721 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 128608155785.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2654774 + ... + 2702783.

It is an arithmetic number, because the mean of its divisors is an integer number (19295245137).

Almost surely, 2^128608155785 is an apocalyptic number.

It is an amenable number.

128608155785 is a deficient number, since it is larger than the sum of its proper divisors (25753805311).

128608155785 is an equidigital number, since it uses as much as digits as its factorization.

128608155785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5362363.

The product of its (nonzero) digits is 5376000, while the sum is 56.

The spelling of 128608155785 in words is "one hundred twenty-eight billion, six hundred eight million, one hundred fifty-five thousand, seven hundred eighty-five".