128388961137 has 16 divisors (see below), whose sum is σ = 175378851648. Its totient is φ = 83513701440.

The previous prime is 128388961091. The next prime is 128388961177. The reversal of 128388961137 is 731169883821.

It is a happy number.

It is not a de Polignac number, because 128388961137 - 2⁶ = 128388961073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128388961177) 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, 2201823 + ... + 2259380.

It is an arithmetic number, because the mean of its divisors is an integer number (10961178228).

Almost surely, 2^128388961137 is an apocalyptic number.

It is an amenable number.

128388961137 is a deficient number, since it is larger than the sum of its proper divisors (46989890511).

128388961137 is a wasteful number, since it uses less digits than its factorization.

128388961137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4461440.

The product of its digits is 3483648, while the sum is 57.

The spelling of 128388961137 in words is "one hundred twenty-eight billion, three hundred eighty-eight million, nine hundred sixty-one thousand, one hundred thirty-seven".