18197803520 has 240 divisors, whose sum is σ = 48638371320. Its totient is φ = 6491013120.

The previous prime is 18197803501. The next prime is 18197803607. The reversal of 18197803520 is 2530879181.

It can be written as a sum of positive squares in 4 ways, for example, as 8059730176 + 10138073344 = 89776^2 + 100688^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31981796 + ... + 31982364.

Almost surely, 2^18197803520 is an apocalyptic number.

18197803520 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 18197803520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24319185660).

18197803520 is an abundant number, since it is smaller than the sum of its proper divisors (30440567800).

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

18197803520 is an equidigital number, since it uses as much as digits as its factorization.

18197803520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667 (or 620 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 44.

The spelling of 18197803520 in words is "eighteen billion, one hundred ninety-seven million, eight hundred three thousand, five hundred twenty".