13127666 has 4 divisors (see below), whose sum is σ = 19691502. Its totient is φ = 6563832.

The previous prime is 13127603. The next prime is 13127669. The reversal of 13127666 is 66672131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66672131 = 29 ⋅2299039.

It can be written as a sum of positive squares in only one way, i.e., 9211225 + 3916441 = 3035^2 + 1979^2 .

It is a super-2 number, since 2×13127666² = 344671229215112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13127669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3281915 + ... + 3281918.

Almost surely, 2^13127666 is an apocalyptic number.

13127666 is a deficient number, since it is larger than the sum of its proper divisors (6563836).

13127666 is an equidigital number, since it uses as much as digits as its factorization.

13127666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6563835.

The product of its digits is 9072, while the sum is 32.

The square root of 13127666 is about 3623.2121108210. The cubic root of 13127666 is about 235.9006692008.

Adding to 13127666 its reverse (66672131), we get a palindrome (79799797).

The spelling of 13127666 in words is "thirteen million, one hundred twenty-seven thousand, six hundred sixty-six".