18318266650836 has 72 divisors (see below), whose sum is σ = 49028921585280. Its totient is φ = 5746834550016.

The previous prime is 18318266650777. The next prime is 18318266650889. The reversal of 18318266650836 is 63805666281381.

It is a super-2 number, since 2×18318266650836² (a number of 27 digits) contains 22 as substring.

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 23 ways as a sum of consecutive naturals, for example, 68831635 + ... + 69097253.

It is an arithmetic number, because the mean of its divisors is an integer number (680957244240).

Almost surely, 2^{18318266650836} is an apocalyptic number.

It is an amenable number.

18318266650836 is an abundant number, since it is smaller than the sum of its proper divisors (30710654934444).

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

18318266650836 is a wasteful number, since it uses less digits than its factorization.

18318266650836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378333 (or 378328 counting only the distinct ones).

The product of its (nonzero) digits is 59719680, while the sum is 63.

The spelling of 18318266650836 in words is "eighteen trillion, three hundred eighteen billion, two hundred sixty-six million, six hundred fifty thousand, eight hundred thirty-six".