13666601 has 4 divisors (see below), whose sum is σ = 14717892. Its totient is φ = 12615312.

The previous prime is 13666553. The next prime is 13666603. The reversal of 13666601 is 10666631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10666631 = 109 ⋅97859.

It can be written as a sum of positive squares in 2 ways, for example, as 8265625 + 5400976 = 2875^2 + 2324^2 .

It is a cyclic number.

It is not a de Polignac number, because 13666601 - 2⁶ = 13666537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13666603) 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, 525626 + ... + 525651.

It is an arithmetic number, because the mean of its divisors is an integer number (3679473).

Almost surely, 2^13666601 is an apocalyptic number.

It is an amenable number.

13666601 is a deficient number, since it is larger than the sum of its proper divisors (1051291).

13666601 is a wasteful number, since it uses less digits than its factorization.

13666601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051290.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 13666601 is about 3696.8366206799. The cubic root of 13666601 is about 239.0856470759.

The spelling of 13666601 in words is "thirteen million, six hundred sixty-six thousand, six hundred one".