18811219718 has 8 divisors (see below), whose sum is σ = 28873035048. Its totient is φ = 9186874704.

The previous prime is 18811219681. The next prime is 18811219733. The reversal of 18811219718 is 81791211881.

It is a happy number.

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

It is a congruent 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, 109367471 + ... + 109367642.

It is an arithmetic number, because the mean of its divisors is an integer number (3609129381).

Almost surely, 2^18811219718 is an apocalyptic number.

18811219718 is a deficient number, since it is larger than the sum of its proper divisors (10061815330).

18811219718 is a wasteful number, since it uses less digits than its factorization.

18811219718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218735158.

The product of its digits is 64512, while the sum is 47.

The spelling of 18811219718 in words is "eighteen billion, eight hundred eleven million, two hundred nineteen thousand, seven hundred eighteen".