12667643 has 2 divisors, whose sum is σ = 12667644. Its totient is φ = 12667642.

The previous prime is 12667631. The next prime is 12667649. The reversal of 12667643 is 34676621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12667643 - 2⁸ = 12667387 is a prime.

It is not a weakly prime, because it can be changed into another prime (12667649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6333821 + 6333822.

It is an arithmetic number, because the mean of its divisors is an integer number (6333822).

Almost surely, 2^12667643 is an apocalyptic number.

12667643 is a deficient number, since it is larger than the sum of its proper divisors (1).

12667643 is an equidigital number, since it uses as much as digits as its factorization.

12667643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288, while the sum is 35.

The square root of 12667643 is about 3559.1632443596. The cubic root of 12667643 is about 233.1123442830.

The spelling of 12667643 in words is "twelve million, six hundred sixty-seven thousand, six hundred forty-three".