128382781854709 has 2 divisors, whose sum is σ = 128382781854710. Its totient is φ = 128382781854708.

The previous prime is 128382781854707. The next prime is 128382781854737. The reversal of 128382781854709 is 907458187283821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91087516064484 + 37295265790225 = 9543978^2 + 6106985^2 .

It is a cyclic number.

It is not a de Polignac number, because 128382781854709 - 2¹ = 128382781854707 is a prime.

Together with 128382781854707, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128382781854703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64191390927354 + 64191390927355.

It is an arithmetic number, because the mean of its divisors is an integer number (64191390927355).

Almost surely, 2^{128382781854709} is an apocalyptic number.

It is an amenable number.

128382781854709 is a deficient number, since it is larger than the sum of its proper divisors (1).

128382781854709 is an equidigital number, since it uses as much as digits as its factorization.

128382781854709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 433520640, while the sum is 73.

The spelling of 128382781854709 in words is "one hundred twenty-eight trillion, three hundred eighty-two billion, seven hundred eighty-one million, eight hundred fifty-four thousand, seven hundred nine".