12668861 has 4 divisors (see below), whose sum is σ = 12690012. Its totient is φ = 12647712.

The previous prime is 12668857. The next prime is 12668881. The reversal of 12668861 is 16886621.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3728761 + 8940100 = 1931^2 + 2990^2 .

It is a cyclic number.

It is not a de Polignac number, because 12668861 - 2² = 12668857 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 (12668881) 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, 9650 + ... + 10883.

It is an arithmetic number, because the mean of its divisors is an integer number (3172503).

Almost surely, 2^12668861 is an apocalyptic number.

It is an amenable number.

12668861 is a deficient number, since it is larger than the sum of its proper divisors (21151).

12668861 is an equidigital number, since it uses as much as digits as its factorization.

12668861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21150.

The product of its digits is 27648, while the sum is 38.

The square root of 12668861 is about 3559.3343478802. The cubic root of 12668861 is about 233.1198153317.

The spelling of 12668861 in words is "twelve million, six hundred sixty-eight thousand, eight hundred sixty-one".