12666641 has 8 divisors (see below), whose sum is σ = 13931904. Its totient is φ = 11442960.

The previous prime is 12666607. The next prime is 12666671. The reversal of 12666641 is 14666621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12666641 - 2²² = 8472337 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12666598 and 12666607.

It is not an unprimeable number, because it can be changed into a prime (12666601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9755 + ... + 10976.

It is an arithmetic number, because the mean of its divisors is an integer number (1741488).

Almost surely, 2^12666641 is an apocalyptic number.

It is an amenable number.

12666641 is a deficient number, since it is larger than the sum of its proper divisors (1265263).

12666641 is a wasteful number, since it uses less digits than its factorization.

12666641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20791.

The product of its digits is 10368, while the sum is 32.

The square root of 12666641 is about 3559.0224781532. The cubic root of 12666641 is about 233.1061977902.

The spelling of 12666641 in words is "twelve million, six hundred sixty-six thousand, six hundred forty-one".