128485685288881 has 4 divisors (see below), whose sum is σ = 128485759944564. Its totient is φ = 128485610633200.

The previous prime is 128485685288827. The next prime is 128485685288887. The reversal of 128485685288881 is 188882586584821.

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 17278853222656 + 111206832066225 = 4156784^2 + 10545465^2 .

It is a cyclic number.

It is not a de Polignac number, because 128485685288881 - 2⁹ = 128485685288369 is a prime.

It is a super-2 number, since 2×128485685288881² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128485685288795 and 128485685288804.

It is not an unprimeable number, because it can be changed into a prime (128485685288887) 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, 34683850 + ... + 38209171.

It is an arithmetic number, because the mean of its divisors is an integer number (32121439986141).

Almost surely, 2^{128485685288881} is an apocalyptic number.

It is an amenable number.

128485685288881 is a deficient number, since it is larger than the sum of its proper divisors (74655683).

128485685288881 is an equidigital number, since it uses as much as digits as its factorization.

128485685288881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74655682.

The product of its digits is 5033164800, while the sum is 82.

The spelling of 128485685288881 in words is "one hundred twenty-eight trillion, four hundred eighty-five billion, six hundred eighty-five million, two hundred eighty-eight thousand, eight hundred eighty-one".