11718221663808 has 168 divisors, whose sum is σ = 36752342686176. Its totient is φ = 3540247603200.

The previous prime is 11718221663791. The next prime is 11718221663881. The reversal of 11718221663808 is 80836612281711.

11718221663808 is a `hidden beast` number, since 1 + 1 + 7 + 182 + 21 + 66 + 380 + 8 = 666.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 696541 + ... + 4890972.

Almost surely, 2^{11718221663808} is an apocalyptic number.

11718221663808 is a gapful number since it is divisible by the number (18) 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 11718221663808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18376171343088).

11718221663808 is an abundant number, since it is smaller than the sum of its proper divisors (25034121022368).

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

11718221663808 is a wasteful number, since it uses less digits than its factorization.

11718221663808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5587873 (or 5587860 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 54.

The spelling of 11718221663808 in words is "eleven trillion, seven hundred eighteen billion, two hundred twenty-one million, six hundred sixty-three thousand, eight hundred eight".