17998981904 has 10 divisors (see below), whose sum is σ = 34873027470. Its totient is φ = 8999490944.

The previous prime is 17998981901. The next prime is 17998981939. The reversal of 17998981904 is 40918989971.

It can be written as a sum of positive squares in only one way, i.e., 16205290000 + 1793691904 = 127300^2 + 42352^2 .

It is not an unprimeable number, because it can be changed into a prime (17998981901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 562468169 + ... + 562468200.

It is an arithmetic number, because the mean of its divisors is an integer number (3487302747).

Almost surely, 2^17998981904 is an apocalyptic number.

It is an amenable number.

17998981904 is a deficient number, since it is larger than the sum of its proper divisors (16874045566).

17998981904 is a wasteful number, since it uses less digits than its factorization.

17998981904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1124936377 (or 1124936371 counting only the distinct ones).

The product of its (nonzero) digits is 11757312, while the sum is 65.

The spelling of 17998981904 in words is "seventeen billion, nine hundred ninety-eight million, nine hundred eighty-one thousand, nine hundred four".