18253981836 has 72 divisors (see below), whose sum is σ = 46754495424. Its totient is φ = 6004072800.

The previous prime is 18253981831. The next prime is 18253981861. The reversal of 18253981836 is 63818935281.

It is not an unprimeable number, because it can be changed into a prime (18253981831) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2826411 + ... + 2832861.

It is an arithmetic number, because the mean of its divisors is an integer number (649367992).

Almost surely, 2^18253981836 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 18253981836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23377247712).

18253981836 is an abundant number, since it is smaller than the sum of its proper divisors (28500513588).

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

18253981836 is a wasteful number, since it uses less digits than its factorization.

18253981836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7491 (or 7486 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 54.

The spelling of 18253981836 in words is "eighteen billion, two hundred fifty-three million, nine hundred eighty-one thousand, eight hundred thirty-six".