13165661111 has 4 divisors (see below), whose sum is σ = 13166287992. Its totient is φ = 13165034232.

The previous prime is 13165661107. The next prime is 13165661129. The reversal of 13165661111 is 11116656131.

13165661111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 13165661111 - 2² = 13165661107 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 (13165661161) 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 3 ways as a sum of consecutive naturals, for example, 280805 + ... + 324318.

It is an arithmetic number, because the mean of its divisors is an integer number (3291571998).

Almost surely, 2^13165661111 is an apocalyptic number.

13165661111 is a deficient number, since it is larger than the sum of its proper divisors (626881).

13165661111 is an equidigital number, since it uses as much as digits as its factorization.

13165661111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626880.

The product of its digits is 3240, while the sum is 32.

The spelling of 13165661111 in words is "thirteen billion, one hundred sixty-five million, six hundred sixty-one thousand, one hundred eleven".