18218853650844 has 144 divisors (see below), whose sum is σ = 58062128866560. Its totient is φ = 4678999269120.

The previous prime is 18218853650759. The next prime is 18218853650861. The reversal of 18218853650844 is 44805635881281.

18218853650844 is a `hidden beast` number, since 1 + 8 + 2 + 1 + 8 + 8 + 536 + 50 + 8 + 44 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 36677214 + ... + 37170629.

It is an arithmetic number, because the mean of its divisors is an integer number (403209228240).

Almost surely, 2^{18218853650844} is an apocalyptic number.

18218853650844 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18218853650844 is an abundant number, since it is smaller than the sum of its proper divisors (39843275215716).

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

18218853650844 is a wasteful number, since it uses less digits than its factorization.

18218853650844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73847960 (or 73847955 counting only the distinct ones).

The product of its (nonzero) digits is 58982400, while the sum is 63.

The spelling of 18218853650844 in words is "eighteen trillion, two hundred eighteen billion, eight hundred fifty-three million, six hundred fifty thousand, eight hundred forty-four".