128594515085 has 4 divisors (see below), whose sum is σ = 154313418108. Its totient is φ = 102875612064.

The previous prime is 128594515069. The next prime is 128594515103. The reversal of 128594515085 is 580515495821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 580515495821 = 887 ⋅654470683.

It can be written as a sum of positive squares in 2 ways, for example, as 71264438116 + 57330076969 = 266954^2 + 239437^2 .

It is a cyclic number.

It is not a de Polignac number, because 128594515085 - 2⁴ = 128594515069 is a prime.

It is a Duffinian number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 12859451504 + ... + 12859451513.

It is an arithmetic number, because the mean of its divisors is an integer number (38578354527).

Almost surely, 2^128594515085 is an apocalyptic number.

It is an amenable number.

128594515085 is a deficient number, since it is larger than the sum of its proper divisors (25718903023).

128594515085 is an equidigital number, since it uses as much as digits as its factorization.

128594515085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25718903022.

The product of its (nonzero) digits is 2880000, while the sum is 53.

The spelling of 128594515085 in words is "one hundred twenty-eight billion, five hundred ninety-four million, five hundred fifteen thousand, eighty-five".