128204363117 has 2 divisors, whose sum is σ = 128204363118. Its totient is φ = 128204363116.

The previous prime is 128204363107. The next prime is 128204363137. The reversal of 128204363117 is 711363402821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122961734281 + 5242628836 = 350659^2 + 72406^2 .

It is an emirp because it is prime and its reverse (711363402821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128204363117 - 2⁴ = 128204363101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128204363107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64102181558 + 64102181559.

It is an arithmetic number, because the mean of its divisors is an integer number (64102181559).

Almost surely, 2^128204363117 is an apocalyptic number.

It is an amenable number.

128204363117 is a deficient number, since it is larger than the sum of its proper divisors (1).

128204363117 is an equidigital number, since it uses as much as digits as its factorization.

128204363117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 38.

Adding to 128204363117 its reverse (711363402821), we get a palindrome (839567765938).

The spelling of 128204363117 in words is "one hundred twenty-eight billion, two hundred four million, three hundred sixty-three thousand, one hundred seventeen".