18468308403840 has 256 divisors, whose sum is σ = 60231891496320. Its totient is φ = 4812017762304.

The previous prime is 18468308403803. The next prime is 18468308403851. The reversal of 18468308403840 is 4830480386481.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14381392 + ... + 15612848.

Almost surely, 2^{18468308403840} is an apocalyptic number.

18468308403840 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 18468308403840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30115945748160).

18468308403840 is an abundant number, since it is smaller than the sum of its proper divisors (41763583092480).

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

18468308403840 is a wasteful number, since it uses less digits than its factorization.

18468308403840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1231659 (or 1231647 counting only the distinct ones).

The product of its (nonzero) digits is 14155776, while the sum is 57.

The spelling of 18468308403840 in words is "eighteen trillion, four hundred sixty-eight billion, three hundred eight million, four hundred three thousand, eight hundred forty".