128829554380217 has 4 divisors (see below), whose sum is σ = 128829621030180. Its totient is φ = 128829487730256.

The previous prime is 128829554380199. The next prime is 128829554380231. The reversal of 128829554380217 is 712083455928821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 76499145611641 + 52330408768576 = 8746379^2 + 7233976^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128829554380217 is a prime.

It is a super-2 number, since 2×128829554380217² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128829554380277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30336242 + ... + 34321227.

It is an arithmetic number, because the mean of its divisors is an integer number (32207405257545).

Almost surely, 2^{128829554380217} is an apocalyptic number.

It is an amenable number.

128829554380217 is a deficient number, since it is larger than the sum of its proper divisors (66649963).

128829554380217 is an equidigital number, since it uses as much as digits as its factorization.

128829554380217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66649962.

The product of its (nonzero) digits is 77414400, while the sum is 65.

The spelling of 128829554380217 in words is "one hundred twenty-eight trillion, eight hundred twenty-nine billion, five hundred fifty-four million, three hundred eighty thousand, two hundred seventeen".