128645242589 has 2 divisors, whose sum is σ = 128645242590. Its totient is φ = 128645242588.

The previous prime is 128645242577. The next prime is 128645242601. The reversal of 128645242589 is 985242546821.

It is a balanced prime because it is at equal distance from previous prime (128645242577) and next prime (128645242601).

It can be written as a sum of positive squares in only one way, i.e., 118255517689 + 10389724900 = 343883^2 + 101930^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128645242589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128645242529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64322621294 + 64322621295.

It is an arithmetic number, because the mean of its divisors is an integer number (64322621295).

Almost surely, 2^128645242589 is an apocalyptic number.

It is an amenable number.

128645242589 is a deficient number, since it is larger than the sum of its proper divisors (1).

128645242589 is an equidigital number, since it uses as much as digits as its factorization.

128645242589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11059200, while the sum is 56.

The spelling of 128645242589 in words is "one hundred twenty-eight billion, six hundred forty-five million, two hundred forty-two thousand, five hundred eighty-nine".