128099985122 has 6 divisors (see below), whose sum is σ = 192150736929. Its totient is φ = 64049739480.

The previous prime is 128099985119. The next prime is 128099985137. The reversal of 128099985122 is 221589990821.

It can be written as a sum of positive squares in 2 ways, for example, as 84932027761 + 43167957361 = 291431^2 + 207769^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=253081.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 379622 + ... + 632702.

Almost surely, 2^128099985122 is an apocalyptic number.

128099985122 is a deficient number, since it is larger than the sum of its proper divisors (64050751807).

128099985122 is an frugal number, since it uses more digits than its factorization.

128099985122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506164 (or 253083 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 56.

The spelling of 128099985122 in words is "one hundred twenty-eight billion, ninety-nine million, nine hundred eighty-five thousand, one hundred twenty-two".