128640914089 has 2 divisors, whose sum is σ = 128640914090. Its totient is φ = 128640914088.

The previous prime is 128640914069. The next prime is 128640914093. The reversal of 128640914089 is 980419046821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127543979689 + 1096934400 = 357133^2 + 33120^2 .

It is an emirp because it is prime and its reverse (980419046821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128640914089 - 2¹⁵ = 128640881321 is a prime.

It is not a weakly prime, because it can be changed into another prime (128640914069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64320457044 + 64320457045.

It is an arithmetic number, because the mean of its divisors is an integer number (64320457045).

Almost surely, 2^128640914089 is an apocalyptic number.

It is an amenable number.

128640914089 is a deficient number, since it is larger than the sum of its proper divisors (1).

128640914089 is an equidigital number, since it uses as much as digits as its factorization.

128640914089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 995328, while the sum is 52.

The spelling of 128640914089 in words is "one hundred twenty-eight billion, six hundred forty million, nine hundred fourteen thousand, eighty-nine".