128235052681 has 8 divisors (see below), whose sum is σ = 142924517280. Its totient is φ = 114339613248.

The previous prime is 128235052637. The next prime is 128235052703. The reversal of 128235052681 is 186250532821.

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

It is a cyclic number.

It is not a de Polignac number, because 128235052681 - 2¹¹ = 128235050633 is a prime.

It is a super-2 number, since 2×128235052681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128235052601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198505951 + ... + 198506596.

It is an arithmetic number, because the mean of its divisors is an integer number (17865564660).

Almost surely, 2^128235052681 is an apocalyptic number.

It is an amenable number.

128235052681 is a deficient number, since it is larger than the sum of its proper divisors (14689464599).

128235052681 is a wasteful number, since it uses less digits than its factorization.

128235052681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397012583.

The product of its (nonzero) digits is 230400, while the sum is 43.

The spelling of 128235052681 in words is "one hundred twenty-eight billion, two hundred thirty-five million, fifty-two thousand, six hundred eighty-one".