18686661111 has 12 divisors (see below), whose sum is σ = 27110753592. Its totient is φ = 12402892656.

The previous prime is 18686661079. The next prime is 18686661113. The reversal of 18686661111 is 11116668681.

It is not a de Polignac number, because 18686661111 - 2⁵ = 18686661079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18686661113) 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, 4571296 + ... + 4575381.

It is an arithmetic number, because the mean of its divisors is an integer number (2259229466).

Almost surely, 2^18686661111 is an apocalyptic number.

18686661111 is a deficient number, since it is larger than the sum of its proper divisors (8424092481).

18686661111 is a wasteful number, since it uses less digits than its factorization.

18686661111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9146910 (or 9146907 counting only the distinct ones).

The product of its digits is 82944, while the sum is 45.

The spelling of 18686661111 in words is "eighteen billion, six hundred eighty-six million, six hundred sixty-one thousand, one hundred eleven".