17994563840 has 144 divisors (see below), whose sum is σ = 47225033856. Its totient is φ = 6515097600.

The previous prime is 17994563791. The next prime is 17994563861. The reversal of 17994563840 is 4836549971.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3390629 + ... + 3395931.

It is an arithmetic number, because the mean of its divisors is an integer number (327951624).

Almost surely, 2^17994563840 is an apocalyptic number.

17994563840 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 17994563840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23612516928).

17994563840 is an abundant number, since it is smaller than the sum of its proper divisors (29230470016).

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

17994563840 is a wasteful number, since it uses less digits than its factorization.

17994563840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5576 (or 5562 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 56.

The spelling of 17994563840 in words is "seventeen billion, nine hundred ninety-four million, five hundred sixty-three thousand, eight hundred forty".