128173523502 has 8 divisors (see below), whose sum is σ = 256347047016. Its totient is φ = 42724507832.

The previous prime is 128173523453. The next prime is 128173523549. The reversal of 128173523502 is 205325371821.

128173523502 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

128173523502 is an admirable number.

It is a congruent 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, 10681126953 + ... + 10681126964.

It is an arithmetic number, because the mean of its divisors is an integer number (32043380877).

Almost surely, 2^128173523502 is an apocalyptic number.

128173523502 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.

128173523502 is a wasteful number, since it uses less digits than its factorization.

128173523502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21362253922.

The product of its (nonzero) digits is 100800, while the sum is 39.

The spelling of 128173523502 in words is "one hundred twenty-eight billion, one hundred seventy-three million, five hundred twenty-three thousand, five hundred two".