12668257 has 4 divisors (see below), whose sum is σ = 14478016. Its totient is φ = 10858500.

The previous prime is 12668237. The next prime is 12668261. The reversal of 12668257 is 75286621.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75286621 = 47 ⋅1601843.

It is a cyclic number.

It is not a de Polignac number, because 12668257 - 2¹⁹ = 12143969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12668237) 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, 904869 + ... + 904882.

It is an arithmetic number, because the mean of its divisors is an integer number (3619504).

Almost surely, 2^12668257 is an apocalyptic number.

It is an amenable number.

12668257 is a deficient number, since it is larger than the sum of its proper divisors (1809759).

12668257 is an equidigital number, since it uses as much as digits as its factorization.

12668257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1809758.

The product of its digits is 40320, while the sum is 37.

The square root of 12668257 is about 3559.2494995434. The cubic root of 12668257 is about 233.1161105366.

The spelling of 12668257 in words is "twelve million, six hundred sixty-eight thousand, two hundred fifty-seven".