18144639371880 has 640 divisors, whose sum is σ = 74427800832000. Its totient is φ = 3875157780480.

The previous prime is 18144639371813. The next prime is 18144639371933. The reversal of 18144639371880 is 8817393644181.

18144639371880 is a `hidden beast` number, since 1 + 8 + 1 + 4 + 463 + 93 + 7 + 1 + 8 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 19944366 + ... + 20834274.

It is an arithmetic number, because the mean of its divisors is an integer number (116293438800).

Almost surely, 2^{18144639371880} is an apocalyptic number.

18144639371880 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 18144639371880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37213900416000).

18144639371880 is an abundant number, since it is smaller than the sum of its proper divisors (56283161460120).

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

18144639371880 is a wasteful number, since it uses less digits than its factorization.

18144639371880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889999 (or 889986 counting only the distinct ones).

The product of its (nonzero) digits is 27869184, while the sum is 63.

The spelling of 18144639371880 in words is "eighteen trillion, one hundred forty-four billion, six hundred thirty-nine million, three hundred seventy-one thousand, eight hundred eighty".