18747994944 has 336 divisors, whose sum is σ = 63378453888. Its totient is φ = 4774035456.

The previous prime is 18747994921. The next prime is 18747994973. The reversal of 18747994944 is 44949974781.

It is a tau number, because it is divible by the number of its divisors (336).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8246992 + ... + 8249264.

Almost surely, 2^18747994944 is an apocalyptic number.

18747994944 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18747994944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31689226944).

18747994944 is an abundant number, since it is smaller than the sum of its proper divisors (44630458944).

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

18747994944 is a wasteful number, since it uses less digits than its factorization.

18747994944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2350 (or 2321 counting only the distinct ones).

The product of its digits is 73156608, while the sum is 66.

The spelling of 18747994944 in words is "eighteen billion, seven hundred forty-seven million, nine hundred ninety-four thousand, nine hundred forty-four".