1938218289111 has 12 divisors (see below), whose sum is σ = 3015006227688. Its totient is φ = 1192749716304.

The previous prime is 1938218289107. The next prime is 1938218289149. The reversal of 1938218289111 is 1119828128391.

It is a happy number.

1938218289111 is a `hidden beast` number, since 1 + 9 + 38 + 218 + 289 + 111 = 666.

It is not a de Polignac number, because 1938218289111 - 2² = 1938218289107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1938218289211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8282984025 + ... + 8282984258.

It is an arithmetic number, because the mean of its divisors is an integer number (251250518974).

Almost surely, 2^{1938218289111} is an apocalyptic number.

1938218289111 is a deficient number, since it is larger than the sum of its proper divisors (1076787938577).

1938218289111 is a wasteful number, since it uses less digits than its factorization.

1938218289111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16565968302 (or 16565968299 counting only the distinct ones).

The product of its digits is 497664, while the sum is 54.

The spelling of 1938218289111 in words is "one trillion, nine hundred thirty-eight billion, two hundred eighteen million, two hundred eighty-nine thousand, one hundred eleven".