12256661 has 4 divisors (see below), whose sum is σ = 12321024. Its totient is φ = 12192300.

The previous prime is 12256649. The next prime is 12256679. The reversal of 12256661 is 16665221.

12256661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 12256661 - 2¹⁰ = 12255637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12256681) 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, 31895 + ... + 32276.

It is an arithmetic number, because the mean of its divisors is an integer number (3080256).

Almost surely, 2^12256661 is an apocalyptic number.

It is an amenable number.

12256661 is a deficient number, since it is larger than the sum of its proper divisors (64363).

12256661 is an equidigital number, since it uses as much as digits as its factorization.

12256661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64362.

The product of its digits is 4320, while the sum is 29.

The square root of 12256661 is about 3500.9514421083. The cubic root of 12256661 is about 230.5635895030.

The spelling of 12256661 in words is "twelve million, two hundred fifty-six thousand, six hundred sixty-one".