18721750000 has 70 divisors (see below), whose sum is σ = 45341763368. Its totient is φ = 7488600000.

The previous prime is 18721749911. The next prime is 18721750001. The reversal of 18721750000 is 5712781.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18721750001) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 212557 + ... + 287443.

Almost surely, 2^18721750000 is an apocalyptic number.

18721750000 is a gapful number since it is divisible by the number (10) 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 18721750000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22670881684).

18721750000 is an abundant number, since it is smaller than the sum of its proper divisors (26620013368).

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

18721750000 is an frugal number, since it uses more digits than its factorization.

18721750000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74925 (or 74894 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 31.

The spelling of 18721750000 in words is "eighteen billion, seven hundred twenty-one million, seven hundred fifty thousand".