128077916385 has 16 divisors (see below), whose sum is σ = 209690357184. Its totient is φ = 66719658432.

The previous prime is 128077916383. The next prime is 128077916389. The reversal of 128077916385 is 583619770821.

It is a happy number.

It is not a de Polignac number, because 128077916385 - 2¹ = 128077916383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128077916383) 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, 99284562 + ... + 99285851.

It is an arithmetic number, because the mean of its divisors is an integer number (13105647324).

Almost surely, 2^128077916385 is an apocalyptic number.

128077916385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128077916385 is a deficient number, since it is larger than the sum of its proper divisors (81612440799).

128077916385 is a wasteful number, since it uses less digits than its factorization.

128077916385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198570464.

The product of its (nonzero) digits is 5080320, while the sum is 57.

The spelling of 128077916385 in words is "one hundred twenty-eight billion, seventy-seven million, nine hundred sixteen thousand, three hundred eighty-five".