18253889536 has 60 divisors (see below), whose sum is σ = 38654705628. Its totient is φ = 8589934592.

The previous prime is 18253889531. The next prime is 18253889567. The reversal of 18253889536 is 63598835281.

It can be written as a sum of positive squares in 2 ways, for example, as 17146331136 + 1107558400 = 130944^2 + 33280^2 .

It is a zygodrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (18253889531) by changing a digit.

In principle, a polygon with 18253889536 sides can be constructed with ruler and compass.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 245760 + ... + 311296.

Almost surely, 2^18253889536 is an apocalyptic number.

18253889536 is a gapful number since it is divisible by the number (16) 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 18253889536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19327352814).

18253889536 is an abundant number, since it is smaller than the sum of its proper divisors (20400816092).

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

18253889536 is an frugal number, since it uses more digits than its factorization.

18253889536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65582 (or 65556 counting only the distinct ones).

The product of its digits is 12441600, while the sum is 58.

The spelling of 18253889536 in words is "eighteen billion, two hundred fifty-three million, eight hundred eighty-nine thousand, five hundred thirty-six".