18128556356208 has 160 divisors (see below), whose sum is σ = 47997585815040. Its totient is φ = 5893835750400.

The previous prime is 18128556356177. The next prime is 18128556356227. The reversal of 18128556356208 is 80265365582181.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2596095085 + ... + 2596102067.

It is an arithmetic number, because the mean of its divisors is an integer number (299984911344).

Almost surely, 2^{18128556356208} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18128556356208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23998792907520).

18128556356208 is an abundant number, since it is smaller than the sum of its proper divisors (29869029458832).

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

18128556356208 is a wasteful number, since it uses less digits than its factorization.

18128556356208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12927 (or 12921 counting only the distinct ones).

The product of its (nonzero) digits is 27648000, while the sum is 60.

The spelling of 18128556356208 in words is "eighteen trillion, one hundred twenty-eight billion, five hundred fifty-six million, three hundred fifty-six thousand, two hundred eight".