128634045517 has 2 divisors, whose sum is σ = 128634045518. Its totient is φ = 128634045516.

The previous prime is 128634045493. The next prime is 128634045521. The reversal of 128634045517 is 715540436821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96071482116 + 32562563401 = 309954^2 + 180451^2 .

It is a cyclic number.

It is not a de Polignac number, because 128634045517 - 2⁷ = 128634045389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128634042517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64317022758 + 64317022759.

It is an arithmetic number, because the mean of its divisors is an integer number (64317022759).

Almost surely, 2^128634045517 is an apocalyptic number.

It is an amenable number.

128634045517 is a deficient number, since it is larger than the sum of its proper divisors (1).

128634045517 is an equidigital number, since it uses as much as digits as its factorization.

128634045517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 806400, while the sum is 46.

The spelling of 128634045517 in words is "one hundred twenty-eight billion, six hundred thirty-four million, forty-five thousand, five hundred seventeen".