12528559981809 has 16 divisors (see below), whose sum is σ = 19652643109440. Its totient is φ = 7861057243200.

The previous prime is 12528559981783. The next prime is 12528559981831. The reversal of 12528559981809 is 90818995582521.

12528559981809 is a `hidden beast` number, since 1 + 2 + 5 + 28 + 5 + 599 + 8 + 1 + 8 + 0 + 9 = 666.

It is not a de Polignac number, because 12528559981809 - 2³¹ = 12526412498161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12528559981009) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 13647668367 + ... + 13647669284.

It is an arithmetic number, because the mean of its divisors is an integer number (1228290194340).

Almost surely, 2^{12528559981809} is an apocalyptic number.

It is an amenable number.

12528559981809 is a deficient number, since it is larger than the sum of its proper divisors (7124083127631).

12528559981809 is a wasteful number, since it uses less digits than its factorization.

12528559981809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27295337677 (or 27295337671 counting only the distinct ones).

The product of its (nonzero) digits is 186624000, while the sum is 72.

The spelling of 12528559981809 in words is "twelve trillion, five hundred twenty-eight billion, five hundred fifty-nine million, nine hundred eighty-one thousand, eight hundred nine".