206111111107 has 4 divisors (see below), whose sum is σ = 224848484856. Its totient is φ = 187373737360.

The previous prime is 206111111093. The next prime is 206111111113. The reversal of 206111111107 is 701111111602.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206111111107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206111114107) 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, 9368686858 + ... + 9368686879.

It is an arithmetic number, because the mean of its divisors is an integer number (56212121214).

Almost surely, 2^206111111107 is an apocalyptic number.

206111111107 is a deficient number, since it is larger than the sum of its proper divisors (18737373749).

206111111107 is a wasteful number, since it uses less digits than its factorization.

206111111107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18737373748.

The product of its (nonzero) digits is 84, while the sum is 22.

Multiplying 206111111107 by its sum of digits (22), we get a palindrome (4534444444354).

Adding to 206111111107 its reverse (701111111602), we get a palindrome (907222222709).

The spelling of 206111111107 in words is "two hundred six billion, one hundred eleven million, one hundred eleven thousand, one hundred seven".