18544994131680 has 864 divisors, whose sum is σ = 67640549243904. Its totient is φ = 4625838637056.

The previous prime is 18544994131541. The next prime is 18544994131721. The reversal of 18544994131680 is 8613149944581.

18544994131680 is a `hidden beast` number, since 1 + 8 + 5 + 4 + 499 + 4 + 131 + 6 + 8 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 16967057214 + ... + 16967058306.

It is an arithmetic number, because the mean of its divisors is an integer number (78287672736).

Almost surely, 2^{18544994131680} is an apocalyptic number.

18544994131680 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 18544994131680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33820274621952).

18544994131680 is an abundant number, since it is smaller than the sum of its proper divisors (49095555112224).

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

18544994131680 is a wasteful number, since it uses less digits than its factorization.

18544994131680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1536 (or 1506 counting only the distinct ones).

The product of its (nonzero) digits is 29859840, while the sum is 63.

The spelling of 18544994131680 in words is "eighteen trillion, five hundred forty-four billion, nine hundred ninety-four million, one hundred thirty-one thousand, six hundred eighty".