128381403905 has 16 divisors (see below), whose sum is σ = 163653758400. Its totient is φ = 96406925760.

The previous prime is 128381403893. The next prime is 128381403907. The reversal of 128381403905 is 509304183821.

It is not a de Polignac number, because 128381403905 - 2¹⁰ = 128381402881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128381403907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6188651 + ... + 6209360.

It is an arithmetic number, because the mean of its divisors is an integer number (10228359900).

Almost surely, 2^128381403905 is an apocalyptic number.

It is an amenable number.

128381403905 is a deficient number, since it is larger than the sum of its proper divisors (35272354495).

128381403905 is a wasteful number, since it uses less digits than its factorization.

128381403905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12398144.

The product of its (nonzero) digits is 207360, while the sum is 44.

The spelling of 128381403905 in words is "one hundred twenty-eight billion, three hundred eighty-one million, four hundred three thousand, nine hundred five".