12666455 has 4 divisors (see below), whose sum is σ = 15199752. Its totient is φ = 10133160.

The previous prime is 12666439. The next prime is 12666461. The reversal of 12666455 is 55466621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55466621 = 7 ⋅7923803.

It is not a de Polignac number, because 12666455 - 2⁴ = 12666439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1266641 + ... + 1266650.

It is an arithmetic number, because the mean of its divisors is an integer number (3799938).

Almost surely, 2^12666455 is an apocalyptic number.

12666455 is a deficient number, since it is larger than the sum of its proper divisors (2533297).

12666455 is an equidigital number, since it uses as much as digits as its factorization.

12666455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2533296.

The product of its digits is 43200, while the sum is 35.

The square root of 12666455 is about 3558.9963472867. The cubic root of 12666455 is about 233.1050567888.

The spelling of 12666455 in words is "twelve million, six hundred sixty-six thousand, four hundred fifty-five".