18881543968 has 144 divisors (see below), whose sum is σ = 45632704320. Its totient is φ = 7646897664.

The previous prime is 18881543957. The next prime is 18881543981. The reversal of 18881543968 is 86934518881.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22135030 + ... + 22135882.

It is an arithmetic number, because the mean of its divisors is an integer number (316893780).

Almost surely, 2^18881543968 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 18881543968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22816352160).

18881543968 is an abundant number, since it is smaller than the sum of its proper divisors (26751160352).

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

18881543968 is a wasteful number, since it uses less digits than its factorization.

18881543968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1639 (or 1624 counting only the distinct ones).

The product of its digits is 13271040, while the sum is 61.

The spelling of 18881543968 in words is "eighteen billion, eight hundred eighty-one million, five hundred forty-three thousand, nine hundred sixty-eight".