8128272507745 has 16 divisors (see below), whose sum is σ = 10507384737360. Its totient is φ = 6000613392384.

The previous prime is 8128272507689. The next prime is 8128272507833. The reversal of 8128272507745 is 5477052728218.

It can be written as a sum of positive squares in 8 ways, for example, as 2464096225536 + 5664176282209 = 1569744^2 + 2379953^2 .

It is not a de Polignac number, because 8128272507745 - 2¹¹ = 8128272505697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8128272507745.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18565584 + ... + 18998353.

It is an arithmetic number, because the mean of its divisors is an integer number (656711546085).

Almost surely, 2^{8128272507745} is an apocalyptic number.

It is an amenable number.

8128272507745 is a deficient number, since it is larger than the sum of its proper divisors (2379112229615).

8128272507745 is a wasteful number, since it uses less digits than its factorization.

8128272507745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37567284.

The product of its (nonzero) digits is 17561600, while the sum is 58.

The spelling of 8128272507745 in words is "eight trillion, one hundred twenty-eight billion, two hundred seventy-two million, five hundred seven thousand, seven hundred forty-five".