18938785111 has 4 divisors (see below), whose sum is σ = 20052831312. Its totient is φ = 17824738912.

The previous prime is 18938785093. The next prime is 18938785127. The reversal of 18938785111 is 11158783981.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18938785111 - 2¹¹ = 18938783063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18938705111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 557023075 + ... + 557023108.

It is an arithmetic number, because the mean of its divisors is an integer number (5013207828).

Almost surely, 2^18938785111 is an apocalyptic number.

18938785111 is a deficient number, since it is larger than the sum of its proper divisors (1114046201).

18938785111 is a wasteful number, since it uses less digits than its factorization.

18938785111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1114046200.

The product of its digits is 483840, while the sum is 52.

The spelling of 18938785111 in words is "eighteen billion, nine hundred thirty-eight million, seven hundred eighty-five thousand, one hundred eleven".