18481392523440 has 1920 divisors, whose sum is σ = 82421558968320. Its totient is φ = 3599343820800.

The previous prime is 18481392523397. The next prime is 18481392523493. The reversal of 18481392523440 is 4432529318481.

It is a happy number.

18481392523440 is a `hidden beast` number, since 1 + 8 + 4 + 81 + 39 + 2 + 523 + 4 + 4 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 9898977387 + ... + 9898979253.

It is an arithmetic number, because the mean of its divisors is an integer number (42927895296).

Almost surely, 2^{18481392523440} is an apocalyptic number.

18481392523440 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 18481392523440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41210779484160).

18481392523440 is an abundant number, since it is smaller than the sum of its proper divisors (63940166444880).

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

18481392523440 is a wasteful number, since it uses less digits than its factorization.

18481392523440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2111 (or 2102 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 54.

The spelling of 18481392523440 in words is "eighteen trillion, four hundred eighty-one billion, three hundred ninety-two million, five hundred twenty-three thousand, four hundred forty".