12663656 has 8 divisors (see below), whose sum is σ = 23744370. Its totient is φ = 6331824.

The previous prime is 12663653. The next prime is 12663689. The reversal of 12663656 is 65636621.

It can be written as a sum of positive squares in only one way, i.e., 7672900 + 4990756 = 2770^2 + 2234^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (12663653) 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 as a sum of consecutive naturals, namely, 791471 + ... + 791486.

Almost surely, 2^12663656 is an apocalyptic number.

It is an amenable number.

12663656 is a deficient number, since it is larger than the sum of its proper divisors (11080714).

12663656 is a wasteful number, since it uses less digits than its factorization.

12663656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1582963 (or 1582959 counting only the distinct ones).

The product of its digits is 38880, while the sum is 35.

The square root of 12663656 is about 3558.6030967221. The cubic root of 12663656 is about 233.0878852093.

The spelling of 12663656 in words is "twelve million, six hundred sixty-three thousand, six hundred fifty-six".