128505883311 has 24 divisors (see below), whose sum is σ = 199931266080. Its totient is φ = 79067399616.

The previous prime is 128505883309. The next prime is 128505883343. The reversal of 128505883311 is 113388505821.

128505883311 is a `hidden beast` number, since 1 + 2 + 8 + 50 + 588 + 3 + 3 + 11 = 666.

It is not a de Polignac number, because 128505883311 - 2¹ = 128505883309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128505883111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 640630 + ... + 816956.

It is an arithmetic number, because the mean of its divisors is an integer number (8330469420).

Almost surely, 2^128505883311 is an apocalyptic number.

128505883311 is a deficient number, since it is larger than the sum of its proper divisors (71425382769).

128505883311 is a wasteful number, since it uses less digits than its factorization.

128505883311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182575 (or 182572 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 45.

The spelling of 128505883311 in words is "one hundred twenty-eight billion, five hundred five million, eight hundred eighty-three thousand, three hundred eleven".