18802638021818 has 8 divisors (see below), whose sum is σ = 32233093751712. Its totient is φ = 8058273437916.

The previous prime is 18802638021803. The next prime is 18802638021847. The reversal of 18802638021818 is 81812083620881.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 671522786480 + ... + 671522786507.

It is an arithmetic number, because the mean of its divisors is an integer number (4029136718964).

Almost surely, 2^{18802638021818} is an apocalyptic number.

18802638021818 is a deficient number, since it is larger than the sum of its proper divisors (13430455729894).

18802638021818 is a wasteful number, since it uses less digits than its factorization.

18802638021818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1343045572996.

The product of its (nonzero) digits is 2359296, while the sum is 56.

The spelling of 18802638021818 in words is "eighteen trillion, eight hundred two billion, six hundred thirty-eight million, twenty-one thousand, eight hundred eighteen".