18218421608716 has 24 divisors (see below), whose sum is σ = 37612225258496. Its totient is φ = 7556027394960.

The previous prime is 18218421608713. The next prime is 18218421608771. The reversal of 18218421608716 is 61780612481281.

It is not an unprimeable number, because it can be changed into a prime (18218421608713) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 10494481626 + ... + 10494483361.

Almost surely, 2^{18218421608716} is an apocalyptic number.

It is an amenable number.

18218421608716 is an abundant number, since it is smaller than the sum of its proper divisors (19393803649780).

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

18218421608716 is a wasteful number, since it uses less digits than its factorization.

18218421608716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20988965029 (or 20988965027 counting only the distinct ones).

The product of its (nonzero) digits is 2064384, while the sum is 55.

The spelling of 18218421608716 in words is "eighteen trillion, two hundred eighteen billion, four hundred twenty-one million, six hundred eight thousand, seven hundred sixteen".