128065537 has 4 divisors (see below), whose sum is σ = 132481620. Its totient is φ = 123649456.

The previous prime is 128065513. The next prime is 128065559. The reversal of 128065537 is 735560821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 735560821 = 18149 ⋅40529.

It can be written as a sum of positive squares in 2 ways, for example, as 95335696 + 32729841 = 9764^2 + 5721^2 .

It is a cyclic number.

It is not a de Polignac number, because 128065537 - 2⁷ = 128065409 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128065496 and 128065505.

It is not an unprimeable number, because it can be changed into a prime (128065507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2207998 + ... + 2208055.

It is an arithmetic number, because the mean of its divisors is an integer number (33120405).

Almost surely, 2^128065537 is an apocalyptic number.

It is an amenable number.

128065537 is a deficient number, since it is larger than the sum of its proper divisors (4416083).

128065537 is an equidigital number, since it uses as much as digits as its factorization.

128065537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4416082.

The product of its (nonzero) digits is 50400, while the sum is 37.

The square root of 128065537 is about 11316.6044819106. The cubic root of 128065537 is about 504.0544172053.

The spelling of 128065537 in words is "one hundred twenty-eight million, sixty-five thousand, five hundred thirty-seven".