128453434217 has 2 divisors, whose sum is σ = 128453434218. Its totient is φ = 128453434216.

The previous prime is 128453434139. The next prime is 128453434223. The reversal of 128453434217 is 712434354821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103361607001 + 25091827216 = 321499^2 + 158404^2 .

It is a cyclic number.

It is not a de Polignac number, because 128453434217 - 2⁸ = 128453433961 is a prime.

It is a super-2 number, since 2×128453434217² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (128453434297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64226717108 + 64226717109.

It is an arithmetic number, because the mean of its divisors is an integer number (64226717109).

Almost surely, 2^128453434217 is an apocalyptic number.

It is an amenable number.

128453434217 is a deficient number, since it is larger than the sum of its proper divisors (1).

128453434217 is an equidigital number, since it uses as much as digits as its factorization.

128453434217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 645120, while the sum is 44.

The spelling of 128453434217 in words is "one hundred twenty-eight billion, four hundred fifty-three million, four hundred thirty-four thousand, two hundred seventeen".