128586868891 has 8 divisors (see below), whose sum is σ = 138492662000. Its totient is φ = 118683146592.

The previous prime is 128586868873. The next prime is 128586868919. The reversal of 128586868891 is 198868685821.

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 128586868891 - 2⁵ = 128586868859 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 128586868891.

It is not an unprimeable number, because it can be changed into a prime (128586868801) 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, 387516 + ... + 638233.

It is an arithmetic number, because the mean of its divisors is an integer number (17311582750).

Almost surely, 2^128586868891 is an apocalyptic number.

128586868891 is a deficient number, since it is larger than the sum of its proper divisors (9905793109).

128586868891 is a wasteful number, since it uses less digits than its factorization.

128586868891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1035405.

The product of its digits is 106168320, while the sum is 70.

The spelling of 128586868891 in words is "one hundred twenty-eight billion, five hundred eighty-six million, eight hundred sixty-eight thousand, eight hundred ninety-one".