18120997248 has 128 divisors (see below), whose sum is σ = 48875788800. Its totient is φ = 5947668480.

The previous prime is 18120997241. The next prime is 18120997283. The reversal of 18120997248 is 84279902181.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a self number, because there is not a number n which added to its sum of digits gives 18120997248.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18120997241) 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, 17078638 + ... + 17079698.

It is an arithmetic number, because the mean of its divisors is an integer number (381842100).

Almost surely, 2^18120997248 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 18120997248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24437894400).

18120997248 is an abundant number, since it is smaller than the sum of its proper divisors (30754791552).

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

18120997248 is a wasteful number, since it uses less digits than its factorization.

18120997248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1720 (or 1708 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 51.

The spelling of 18120997248 in words is "eighteen billion, one hundred twenty million, nine hundred ninety-seven thousand, two hundred forty-eight".