13666457 has 4 divisors (see below), whose sum is σ = 15618816. Its totient is φ = 11714100.

The previous prime is 13666451. The next prime is 13666463. The reversal of 13666457 is 75466631.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (13666451) and next prime (13666463).

It is a cyclic number.

It is not a de Polignac number, because 13666457 - 2⁴ = 13666441 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13666457.

It is not an unprimeable number, because it can be changed into a prime (13666451) 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, 976169 + ... + 976182.

It is an arithmetic number, because the mean of its divisors is an integer number (3904704).

Almost surely, 2^13666457 is an apocalyptic number.

It is an amenable number.

13666457 is a deficient number, since it is larger than the sum of its proper divisors (1952359).

13666457 is an equidigital number, since it uses as much as digits as its factorization.

13666457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1952358.

The product of its digits is 90720, while the sum is 38.

The square root of 13666457 is about 3696.8171445177. The cubic root of 13666457 is about 239.0848073535.

The spelling of 13666457 in words is "thirteen million, six hundred sixty-six thousand, four hundred fifty-seven".