128608155817 has 2 divisors, whose sum is σ = 128608155818. Its totient is φ = 128608155816.

The previous prime is 128608155721. The next prime is 128608155821. The reversal of 128608155817 is 718551806821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125814927616 + 2793228201 = 354704^2 + 52851^2 .

It is an emirp because it is prime and its reverse (718551806821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128608155817 - 2¹¹ = 128608153769 is a prime.

It is not a weakly prime, because it can be changed into another prime (128608155877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64304077908 + 64304077909.

It is an arithmetic number, because the mean of its divisors is an integer number (64304077909).

Almost surely, 2^128608155817 is an apocalyptic number.

It is an amenable number.

128608155817 is a deficient number, since it is larger than the sum of its proper divisors (1).

128608155817 is an equidigital number, since it uses as much as digits as its factorization.

128608155817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1075200, while the sum is 52.

The spelling of 128608155817 in words is "one hundred twenty-eight billion, six hundred eight million, one hundred fifty-five thousand, eight hundred seventeen".