128959992099 has 12 divisors (see below), whose sum is σ = 186280731312. Its totient is φ = 85970934000.

The previous prime is 128959992023. The next prime is 128959992127. The reversal of 128959992099 is 990299959821.

128959992099 is a `hidden beast` number, since 1 + 2 + 8 + 9 + 599 + 9 + 20 + 9 + 9 = 666.

It is a Cunningham number, because it is equal to 359110²-1.

It is a de Polignac number, because none of the positive numbers 2^k-128959992099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128959990099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 179554 + ... + 538664.

It is an arithmetic number, because the mean of its divisors is an integer number (15523394276).

Almost surely, 2^128959992099 is an apocalyptic number.

128959992099 is a deficient number, since it is larger than the sum of its proper divisors (57320739213).

128959992099 is a wasteful number, since it uses less digits than its factorization.

128959992099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399018 (or 399015 counting only the distinct ones).

The product of its (nonzero) digits is 85030560, while the sum is 72.

The spelling of 128959992099 in words is "one hundred twenty-eight billion, nine hundred fifty-nine million, nine hundred ninety-two thousand, ninety-nine".