18636673680 has 480 divisors, whose sum is σ = 68273487360. Its totient is φ = 4541644800.

The previous prime is 18636673669. The next prime is 18636673681. The reversal of 18636673680 is 8637663681.

It is not an unprimeable number, because it can be changed into a prime (18636673681) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 72516112 + ... + 72516368.

It is an arithmetic number, because the mean of its divisors is an integer number (142236432).

Almost surely, 2^18636673680 is an apocalyptic number.

18636673680 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 18636673680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34136743680).

18636673680 is an abundant number, since it is smaller than the sum of its proper divisors (49636813680).

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

18636673680 is a wasteful number, since it uses less digits than its factorization.

18636673680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479 (or 470 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 54.

Subtracting from 18636673680 its reverse (8637663681), we obtain a palindrome (9999009999).

The spelling of 18636673680 in words is "eighteen billion, six hundred thirty-six million, six hundred seventy-three thousand, six hundred eighty".