128040520105039 has 2 divisors, whose sum is σ = 128040520105040. Its totient is φ = 128040520105038.

The previous prime is 128040520105019. The next prime is 128040520105093. The reversal of 128040520105039 is 930501025040821.

It is a happy number.

Together with next prime (128040520105093) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128040520105039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128040520104992 and 128040520105010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128040520105019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64020260052519 + 64020260052520.

It is an arithmetic number, because the mean of its divisors is an integer number (64020260052520).

Almost surely, 2^{128040520105039} is an apocalyptic number.

128040520105039 is a deficient number, since it is larger than the sum of its proper divisors (1).

128040520105039 is an equidigital number, since it uses as much as digits as its factorization.

128040520105039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86400, while the sum is 40.

The spelling of 128040520105039 in words is "one hundred twenty-eight trillion, forty billion, five hundred twenty million, one hundred five thousand, thirty-nine".