18944450432 has 64 divisors (see below), whose sum is σ = 38039492400. Its totient is φ = 9397555200.

The previous prime is 18944450417. The next prime is 18944450449. The reversal of 18944450432 is 23405444981.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14340332 + ... + 14341652.

Almost surely, 2^18944450432 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 18944450432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19019746200).

18944450432 is an abundant number, since it is smaller than the sum of its proper divisors (19095041968).

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

18944450432 is a wasteful number, since it uses less digits than its factorization.

18944450432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2135 (or 2123 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 44.

The spelling of 18944450432 in words is "eighteen billion, nine hundred forty-four million, four hundred fifty thousand, four hundred thirty-two".