13665366 has 48 divisors (see below), whose sum is σ = 34791120. Its totient is φ = 3821760.

The previous prime is 13665359. The next prime is 13665367. The reversal of 13665366 is 66356631.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 13665366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13665367) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81 + ... + 5228.

It is an arithmetic number, because the mean of its divisors is an integer number (724815).

Almost surely, 2^13665366 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13665366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17395560).

13665366 is an abundant number, since it is smaller than the sum of its proper divisors (21125754).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13665366 is a wasteful number, since it uses less digits than its factorization.

13665366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5341 (or 5338 counting only the distinct ones).

The product of its digits is 58320, while the sum is 36.

The square root of 13665366 is about 3696.6695822050. The cubic root of 13665366 is about 239.0784450982.

The spelling of 13665366 in words is "thirteen million, six hundred sixty-five thousand, three hundred sixty-six".