18161112003840 has 576 divisors, whose sum is σ = 69950873395200. Its totient is φ = 4435213418496.

The previous prime is 18161112003737. The next prime is 18161112003869. The reversal of 18161112003840 is 4830021116181.

18161112003840 is a `hidden beast` number, since 1 + 8 + 1 + 61 + 11 + 200 + 384 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (576).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18161112003795 and 18161112003804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 56899416 + ... + 57217704.

Almost surely, 2^{18161112003840} is an apocalyptic number.

18161112003840 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 18161112003840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34975436697600).

18161112003840 is an abundant number, since it is smaller than the sum of its proper divisors (51789761391360).

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

18161112003840 is a wasteful number, since it uses less digits than its factorization.

18161112003840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318459 (or 318439 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The spelling of 18161112003840 in words is "eighteen trillion, one hundred sixty-one billion, one hundred twelve million, three thousand, eight hundred forty".