18745784568 has 144 divisors (see below), whose sum is σ = 60964263360. Its totient is φ = 5183136000.

The previous prime is 18745784549. The next prime is 18745784593. The reversal of 18745784568 is 86548754781.

It is a happy number.

18745784568 is a `hidden beast` number, since 1 + 8 + 7 + 4 + 578 + 4 + 56 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 23668 + ... + 195068.

It is an arithmetic number, because the mean of its divisors is an integer number (423362940).

Almost surely, 2^18745784568 is an apocalyptic number.

18745784568 is a gapful number since it is divisible by the number (18) 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 18745784568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30482131680).

18745784568 is an abundant number, since it is smaller than the sum of its proper divisors (42218478792).

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

18745784568 is a wasteful number, since it uses less digits than its factorization.

18745784568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171458 (or 171444 counting only the distinct ones).

The product of its digits is 60211200, while the sum is 63.

The spelling of 18745784568 in words is "eighteen billion, seven hundred forty-five million, seven hundred eighty-four thousand, five hundred sixty-eight".