12660251 has 4 divisors (see below), whose sum is σ = 13326600. Its totient is φ = 11993904.

The previous prime is 12660229. The next prime is 12660283. The reversal of 12660251 is 15206621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12660251 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12660551) by changing a digit.

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, 333146 + ... + 333183.

It is an arithmetic number, because the mean of its divisors is an integer number (3331650).

Almost surely, 2^12660251 is an apocalyptic number.

12660251 is a deficient number, since it is larger than the sum of its proper divisors (666349).

12660251 is an equidigital number, since it uses as much as digits as its factorization.

12660251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666348.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 12660251 is about 3558.1246464957. The cubic root of 12660251 is about 233.0669924699.

Adding to 12660251 its reverse (15206621), we get a palindrome (27866872).

The spelling of 12660251 in words is "twelve million, six hundred sixty thousand, two hundred fifty-one".