128375231616 has 128 divisors (see below), whose sum is σ = 382564790400. Its totient is φ = 42376172544.

The previous prime is 128375231591. The next prime is 128375231617. The reversal of 128375231616 is 616132573821.

It is a happy number.

128375231616 is a `hidden beast` number, since 1 + 2 + 8 + 3 + 7 + 5 + 23 + 1 + 616 = 666.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (128375231617) 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, 175650 + ... + 536286.

It is an arithmetic number, because the mean of its divisors is an integer number (2988787425).

Almost surely, 2^128375231616 is an apocalyptic number.

128375231616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128375231616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191282395200).

128375231616 is an abundant number, since it is smaller than the sum of its proper divisors (254189558784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128375231616 is a wasteful number, since it uses less digits than its factorization.

128375231616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360763 (or 360745 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The spelling of 128375231616 in words is "one hundred twenty-eight billion, three hundred seventy-five million, two hundred thirty-one thousand, six hundred sixteen".