18709953472 has 56 divisors (see below), whose sum is σ = 42504384384. Its totient is φ = 8004778752.

The previous prime is 18709953469. The next prime is 18709953473. The reversal of 18709953472 is 27435990781.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18709953473) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 227403 + ... + 298549.

It is an arithmetic number, because the mean of its divisors is an integer number (759006864).

Almost surely, 2^18709953472 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 18709953472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21252192192).

18709953472 is an abundant number, since it is smaller than the sum of its proper divisors (23794430912).

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

18709953472 is an equidigital number, since it uses as much as digits as its factorization.

18709953472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71753 (or 71743 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 55.

The spelling of 18709953472 in words is "eighteen billion, seven hundred nine million, nine hundred fifty-three thousand, four hundred seventy-two".