206165720111 has 8 divisors (see below), whose sum is σ = 222057848544. Its totient is φ = 190278338400.

The previous prime is 206165720063. The next prime is 206165720141. The reversal of 206165720111 is 111027561602.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206165720111 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 (206165720141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1096211 + ... + 1270436.

It is an arithmetic number, because the mean of its divisors is an integer number (27757231068).

Almost surely, 2^206165720111 is an apocalyptic number.

206165720111 is a deficient number, since it is larger than the sum of its proper divisors (15892128433).

206165720111 is a wasteful number, since it uses less digits than its factorization.

206165720111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2373361.

The product of its (nonzero) digits is 5040, while the sum is 32.

The spelling of 206165720111 in words is "two hundred six billion, one hundred sixty-five million, seven hundred twenty thousand, one hundred eleven".