18888446856 has 128 divisors (see below), whose sum is σ = 49250304000. Its totient is φ = 6032662272.

The previous prime is 18888446849. The next prime is 18888446869. The reversal of 18888446856 is 65864488881.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11316390 + ... + 11318058.

It is an arithmetic number, because the mean of its divisors is an integer number (384768000).

Almost surely, 2^18888446856 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 18888446856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24625152000).

18888446856 is an abundant number, since it is smaller than the sum of its proper divisors (30361857144).

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

18888446856 is a wasteful number, since it uses less digits than its factorization.

18888446856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1931 (or 1927 counting only the distinct ones).

The product of its digits is 94371840, while the sum is 66.

The spelling of 18888446856 in words is "eighteen billion, eight hundred eighty-eight million, four hundred forty-six thousand, eight hundred fifty-six".