18778398894024 has 512 divisors, whose sum is σ = 62236601856000. Its totient is φ = 4573930291200.

The previous prime is 18778398894011. The next prime is 18778398894029. The reversal of 18778398894024 is 42049889387781.

It is a Cunningham number, because it is equal to 4333405²-1.

It is not an unprimeable number, because it can be changed into a prime (18778398894029) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 5668093392 + ... + 5668096704.

It is an arithmetic number, because the mean of its divisors is an integer number (121555863000).

Almost surely, 2^{18778398894024} is an apocalyptic number.

18778398894024 is a gapful number since it is divisible by the number (14) 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 18778398894024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31118300928000).

18778398894024 is an abundant number, since it is smaller than the sum of its proper divisors (43458202961976).

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

18778398894024 is a wasteful number, since it uses less digits than its factorization.

18778398894024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4949 (or 4945 counting only the distinct ones).

The product of its (nonzero) digits is 1560674304, while the sum is 78.

The spelling of 18778398894024 in words is "eighteen trillion, seven hundred seventy-eight billion, three hundred ninety-eight million, eight hundred ninety-four thousand, twenty-four".