13666507 has 2 divisors, whose sum is σ = 13666508. Its totient is φ = 13666506.

The previous prime is 13666493. The next prime is 13666517. The reversal of 13666507 is 70566631.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13666507 is a prime.

It is not a weakly prime, because it can be changed into another prime (13666517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6833253 + 6833254.

It is an arithmetic number, because the mean of its divisors is an integer number (6833254).

Almost surely, 2^13666507 is an apocalyptic number.

13666507 is a deficient number, since it is larger than the sum of its proper divisors (1).

13666507 is an equidigital number, since it uses as much as digits as its factorization.

13666507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 13666507 is about 3696.8239070856. The cubic root of 13666507 is about 239.0850989245.

The spelling of 13666507 in words is "thirteen million, six hundred sixty-six thousand, five hundred seven".