18809785850624 has 144 divisors (see below), whose sum is σ = 38847371049984. Its totient is φ = 9080380108800.

The previous prime is 18809785850623. The next prime is 18809785850627. The reversal of 18809785850624 is 42605858790881.

It is a Cunningham number, because it is equal to 4337025²-1.

It is not an unprimeable number, because it can be changed into a prime (18809785850623) 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, 9740954939 + ... + 9740956869.

Almost surely, 2^{18809785850624} 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 18809785850624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19423685524992).

18809785850624 is an abundant number, since it is smaller than the sum of its proper divisors (20037585199360).

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

18809785850624 is a wasteful number, since it uses less digits than its factorization.

18809785850624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4194 (or 4180 counting only the distinct ones).

The product of its (nonzero) digits is 309657600, while the sum is 71.

The spelling of 18809785850624 in words is "eighteen trillion, eight hundred nine billion, seven hundred eighty-five million, eight hundred fifty thousand, six hundred twenty-four".