128860316785 has 4 divisors (see below), whose sum is σ = 154632380148. Its totient is φ = 103088253424.

The previous prime is 128860316773. The next prime is 128860316789. The reversal of 128860316785 is 587613068821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 587613068821 = 733 ⋅801654937.

It can be written as a sum of positive squares in 2 ways, for example, as 39286411264 + 89573905521 = 198208^2 + 299289^2 .

It is a cyclic number.

It is not a de Polignac number, because 128860316785 - 2¹⁹ = 128859792497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128860316789) 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, 12886031674 + ... + 12886031683.

It is an arithmetic number, because the mean of its divisors is an integer number (38658095037).

Almost surely, 2^128860316785 is an apocalyptic number.

It is an amenable number.

128860316785 is a deficient number, since it is larger than the sum of its proper divisors (25772063363).

128860316785 is an equidigital number, since it uses as much as digits as its factorization.

128860316785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25772063362.

The product of its (nonzero) digits is 3870720, while the sum is 55.

The spelling of 128860316785 in words is "one hundred twenty-eight billion, eight hundred sixty million, three hundred sixteen thousand, seven hundred eighty-five".