17999443968 has 192 divisors, whose sum is σ = 52623043200. Its totient is φ = 5425889280.

The previous prime is 17999443963. The next prime is 17999443997. The reversal of 17999443968 is 86934499971.

It is a tau number, because it is divible by the number of its divisors (192).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17999443961) 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, 15476155 + ... + 15477317.

It is an arithmetic number, because the mean of its divisors is an integer number (274078350).

Almost surely, 2^17999443968 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 17999443968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26311521600).

17999443968 is an abundant number, since it is smaller than the sum of its proper divisors (34623599232).

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

17999443968 is a wasteful number, since it uses less digits than its factorization.

17999443968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1428 (or 1408 counting only the distinct ones).

The product of its digits is 105815808, while the sum is 69.

The spelling of 17999443968 in words is "seventeen billion, nine hundred ninety-nine million, four hundred forty-three thousand, nine hundred sixty-eight".