18331641987696 has 160 divisors (see below), whose sum is σ = 52823015092800. Its totient is φ = 6086816686080.

The previous prime is 18331641987691. The next prime is 18331641987713. The reversal of 18331641987696 is 69678914613381.

18331641987696 is a `hidden beast` number, since 1 + 8 + 33 + 16 + 419 + 87 + 6 + 96 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18331641987691) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1075728936 + ... + 1075745976.

It is an arithmetic number, because the mean of its divisors is an integer number (330143844330).

Almost surely, 2^{18331641987696} is an apocalyptic number.

18331641987696 is a gapful number since it is divisible by the number (16) 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 18331641987696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26411507546400).

18331641987696 is an abundant number, since it is smaller than the sum of its proper divisors (34491373105104).

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

18331641987696 is a wasteful number, since it uses less digits than its factorization.

18331641987696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26584 (or 26572 counting only the distinct ones).

The product of its digits is 282175488, while the sum is 72.

The spelling of 18331641987696 in words is "eighteen trillion, three hundred thirty-one billion, six hundred forty-one million, nine hundred eighty-seven thousand, six hundred ninety-six".