13666369 has 2 divisors, whose sum is σ = 13666370. Its totient is φ = 13666368.

The previous prime is 13666321. The next prime is 13666391. The reversal of 13666369 is 96366631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13601344 + 65025 = 3688^2 + 255^2 .

It is a cyclic number.

It is not a de Polignac number, because 13666369 - 2⁹ = 13665857 is a prime.

It is a super-2 number, since 2×13666369² = 373539283288322, which contains 22 as substring.

It is equal to p₈₈₉₇₈₀ and since 13666369 and 889780 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (13666309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6833184 + 6833185.

It is an arithmetic number, because the mean of its divisors is an integer number (6833185).

Almost surely, 2^13666369 is an apocalyptic number.

It is an amenable number.

13666369 is a deficient number, since it is larger than the sum of its proper divisors (1).

13666369 is an equidigital number, since it uses as much as digits as its factorization.

13666369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 40.

The square root of 13666369 is about 3696.8052423681. The cubic root of 13666369 is about 239.0842941869.

The spelling of 13666369 in words is "thirteen million, six hundred sixty-six thousand, three hundred sixty-nine".