128180205145 has 4 divisors (see below), whose sum is σ = 153816246180. Its totient is φ = 102544164112.

The previous prime is 128180205067. The next prime is 128180205151. The reversal of 128180205145 is 541502081821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50633550361 + 77546654784 = 225019^2 + 278472^2 .

It is a cyclic number.

It is not a de Polignac number, because 128180205145 - 2¹⁹ = 128179680857 is a prime.

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, 12818020510 + ... + 12818020519.

It is an arithmetic number, because the mean of its divisors is an integer number (38454061545).

Almost surely, 2^128180205145 is an apocalyptic number.

It is an amenable number.

128180205145 is a deficient number, since it is larger than the sum of its proper divisors (25636041035).

128180205145 is an equidigital number, since it uses as much as digits as its factorization.

128180205145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25636041034.

The product of its (nonzero) digits is 25600, while the sum is 37.

Adding to 128180205145 its reverse (541502081821), we get a palindrome (669682286966).

The spelling of 128180205145 in words is "one hundred twenty-eight billion, one hundred eighty million, two hundred five thousand, one hundred forty-five".