128825806218 has 8 divisors (see below), whose sum is σ = 257651612448. Its totient is φ = 42941935404.

The previous prime is 128825806199. The next prime is 128825806237. The reversal of 128825806218 is 812608528821.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (128825806199) and next prime (128825806237).

It is a sphenic number, since it is the product of 3 distinct primes.

128825806218 is an admirable number.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10735483846 + ... + 10735483857.

It is an arithmetic number, because the mean of its divisors is an integer number (32206451556).

Almost surely, 2^128825806218 is an apocalyptic number.

128825806218 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128825806218 is a wasteful number, since it uses less digits than its factorization.

128825806218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21470967708.

The product of its (nonzero) digits is 983040, while the sum is 51.

The spelling of 128825806218 in words is "one hundred twenty-eight billion, eight hundred twenty-five million, eight hundred six thousand, two hundred eighteen".