18317643704640 has 840 divisors, whose sum is σ = 75844887224832. Its totient is φ = 4184261867520.

The previous prime is 18317643704629. The next prime is 18317643704641. The reversal of 18317643704640 is 4640734671381.

It is a happy number.

18317643704640 is a `hidden beast` number, since 1 + 8 + 3 + 1 + 76 + 43 + 70 + 464 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (840).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18317643704641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 2620171545 + ... + 2620178535.

Almost surely, 2^{18317643704640} is an apocalyptic number.

18317643704640 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 18317643704640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37922443612416).

18317643704640 is an abundant number, since it is smaller than the sum of its proper divisors (57527243520192).

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

18317643704640 is a wasteful number, since it uses less digits than its factorization.

18317643704640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9097 (or 9071 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 54.

The spelling of 18317643704640 in words is "eighteen trillion, three hundred seventeen billion, six hundred forty-three million, seven hundred four thousand, six hundred forty".