128854609693 has 2 divisors, whose sum is σ = 128854609694. Its totient is φ = 128854609692.

The previous prime is 128854609679. The next prime is 128854609771. The reversal of 128854609693 is 396906458821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66335608249 + 62519001444 = 257557^2 + 250038^2 .

It is an emirp because it is prime and its reverse (396906458821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128854609693 - 2²¹ = 128852512541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128854609603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64427304846 + 64427304847.

It is an arithmetic number, because the mean of its divisors is an integer number (64427304847).

Almost surely, 2^128854609693 is an apocalyptic number.

It is an amenable number.

128854609693 is a deficient number, since it is larger than the sum of its proper divisors (1).

128854609693 is an equidigital number, since it uses as much as digits as its factorization.

128854609693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22394880, while the sum is 61.

The spelling of 128854609693 in words is "one hundred twenty-eight billion, eight hundred fifty-four million, six hundred nine thousand, six hundred ninety-three".