18039943312 has 20 divisors (see below), whose sum is σ = 37008413676. Its totient is φ = 8489384960.

The previous prime is 18039943301. The next prime is 18039943333. The reversal of 18039943312 is 21334993081.

It can be written as a sum of positive squares in 2 ways, for example, as 14351081616 + 3688861696 = 119796^2 + 60736^2 .

It is a super-3 number, since 3×18039943312³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 33161389 + ... + 33161932.

Almost surely, 2^18039943312 is an apocalyptic number.

It is an amenable number.

18039943312 is an abundant number, since it is smaller than the sum of its proper divisors (18968470364).

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

18039943312 is a wasteful number, since it uses less digits than its factorization.

18039943312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66323346 (or 66323340 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 43.

The spelling of 18039943312 in words is "eighteen billion, thirty-nine million, nine hundred forty-three thousand, three hundred twelve".