128546555920 has 20 divisors (see below), whose sum is σ = 298870742700. Its totient is φ = 51418622336.

The previous prime is 128546555899. The next prime is 128546556053. The reversal of 128546555920 is 29555645821.

It can be written as a sum of positive squares in 2 ways, for example, as 101503411216 + 27043144704 = 318596^2 + 164448^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 803415895 + ... + 803416054.

It is an arithmetic number, because the mean of its divisors is an integer number (14943537135).

Almost surely, 2^128546555920 is an apocalyptic number.

128546555920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128546555920 is an abundant number, since it is smaller than the sum of its proper divisors (170324186780).

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

128546555920 is a wasteful number, since it uses less digits than its factorization.

128546555920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1606831962 (or 1606831956 counting only the distinct ones).

The product of its (nonzero) digits is 4320000, while the sum is 52.

The spelling of 128546555920 in words is "one hundred twenty-eight billion, five hundred forty-six million, five hundred fifty-five thousand, nine hundred twenty".