13661215111 has 16 divisors (see below), whose sum is σ = 14347238400. Its totient is φ = 12996422208.

The previous prime is 13661215081. The next prime is 13661215123. The reversal of 13661215111 is 11151216631.

13661215111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 13661215111 - 2²⁵ = 13627660679 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13661215111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13661215511) 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 15 ways as a sum of consecutive naturals, for example, 229770 + ... + 283048.

It is an arithmetic number, because the mean of its divisors is an integer number (896702400).

Almost surely, 2^13661215111 is an apocalyptic number.

13661215111 is a deficient number, since it is larger than the sum of its proper divisors (686023289).

13661215111 is an equidigital number, since it uses as much as digits as its factorization.

13661215111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53478.

The product of its digits is 1080, while the sum is 28.

The spelling of 13661215111 in words is "thirteen billion, six hundred sixty-one million, two hundred fifteen thousand, one hundred eleven".