13666606 has 8 divisors (see below), whose sum is σ = 21705840. Its totient is φ = 6431328.

The previous prime is 13666603. The next prime is 13666607. The reversal of 13666606 is 60666631.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×13666606² = 373552239118472, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34), and also a Moran number because the ratio is a prime number: 401959 = 13666606 / (1 + 3 + 6 + 6 + 6 + 6 + 0 + 6).

It is a congruent 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, 200946 + ... + 201013.

It is an arithmetic number, because the mean of its divisors is an integer number (2713230).

Almost surely, 2^13666606 is an apocalyptic number.

13666606 is a deficient number, since it is larger than the sum of its proper divisors (8039234).

13666606 is a wasteful number, since it uses less digits than its factorization.

13666606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401978.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 13666606 is about 3696.8372969337. The cubic root of 13666606 is about 239.0856762329.

The spelling of 13666606 in words is "thirteen million, six hundred sixty-six thousand, six hundred six".