128385782785 has 16 divisors (see below), whose sum is σ = 165975183360. Its totient is φ = 94772963520.

The previous prime is 128385782779. The next prime is 128385782809. The reversal of 128385782785 is 587287583821.

It is not a de Polignac number, because 128385782785 - 2¹¹ = 128385780737 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186481 + ... + 539950.

It is an arithmetic number, because the mean of its divisors is an integer number (10373448960).

Almost surely, 2^128385782785 is an apocalyptic number.

It is an amenable number.

128385782785 is a deficient number, since it is larger than the sum of its proper divisors (37589400575).

128385782785 is a wasteful number, since it uses less digits than its factorization.

128385782785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 729168.

The product of its digits is 60211200, while the sum is 64.

The spelling of 128385782785 in words is "one hundred twenty-eight billion, three hundred eighty-five million, seven hundred eighty-two thousand, seven hundred eighty-five".