13266661 has 4 divisors (see below), whose sum is σ = 13575232. Its totient is φ = 12958092.

The previous prime is 13266641. The next prime is 13266677. The reversal of 13266661 is 16666231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13266661 - 2¹⁵ = 13233893 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 (13266641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154221 + ... + 154306.

It is an arithmetic number, because the mean of its divisors is an integer number (3393808).

Almost surely, 2^13266661 is an apocalyptic number.

It is an amenable number.

13266661 is a deficient number, since it is larger than the sum of its proper divisors (308571).

13266661 is an equidigital number, since it uses as much as digits as its factorization.

13266661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308570.

The product of its digits is 7776, while the sum is 31.

The square root of 13266661 is about 3642.3427900185. The cubic root of 13266661 is about 236.7303157071.

The spelling of 13266661 in words is "thirteen million, two hundred sixty-six thousand, six hundred sixty-one".