18681327635720 has 64 divisors (see below), whose sum is σ = 43391260362240. Its totient is φ = 7231086604800.

The previous prime is 18681327635717. The next prime is 18681327635731. The reversal of 18681327635720 is 2753672318681.

It is a self number, because there is not a number n which added to its sum of digits gives 18681327635720.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22824284 + ... + 23628596.

It is an arithmetic number, because the mean of its divisors is an integer number (677988443160).

Almost surely, 2^{18681327635720} is an apocalyptic number.

18681327635720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18681327635720 is an abundant number, since it is smaller than the sum of its proper divisors (24709932726520).

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

18681327635720 is a wasteful number, since it uses less digits than its factorization.

18681327635720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823086 (or 823082 counting only the distinct ones).

The product of its (nonzero) digits is 20321280, while the sum is 59.

The spelling of 18681327635720 in words is "eighteen trillion, six hundred eighty-one billion, three hundred twenty-seven million, six hundred thirty-five thousand, seven hundred twenty".