18213553488 has 80 divisors (see below), whose sum is σ = 50964238080. Its totient is φ = 5571743232.

The previous prime is 18213553481. The next prime is 18213553493. The reversal of 18213553488 is 88435531281.

It is a super-2 number, since 2×18213553488² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18213553481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23593 + ... + 192311.

It is an arithmetic number, because the mean of its divisors is an integer number (637052976).

Almost surely, 2^18213553488 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 18213553488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25482119040).

18213553488 is an abundant number, since it is smaller than the sum of its proper divisors (32750684592).

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

18213553488 is a wasteful number, since it uses less digits than its factorization.

18213553488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168916 (or 168910 counting only the distinct ones).

The product of its digits is 921600, while the sum is 48.

The spelling of 18213553488 in words is "eighteen billion, two hundred thirteen million, five hundred fifty-three thousand, four hundred eighty-eight".