128445572945 has 4 divisors (see below), whose sum is σ = 154134687540. Its totient is φ = 102756458352.

The previous prime is 128445572939. The next prime is 128445572953. The reversal of 128445572945 is 549275544821.

It is a happy number.

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 23235514624 + 105210058321 = 152432^2 + 324361^2 .

It is a cyclic number.

It is not a de Polignac number, because 128445572945 - 2³⁰ = 127371831121 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12844557290 + ... + 12844557299.

It is an arithmetic number, because the mean of its divisors is an integer number (38533671885).

Almost surely, 2^128445572945 is an apocalyptic number.

It is an amenable number.

128445572945 is a deficient number, since it is larger than the sum of its proper divisors (25689114595).

128445572945 is an equidigital number, since it uses as much as digits as its factorization.

128445572945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25689114594.

The product of its digits is 16128000, while the sum is 56.

The spelling of 128445572945 in words is "one hundred twenty-eight billion, four hundred forty-five million, five hundred seventy-two thousand, nine hundred forty-five".