12664543 has 2 divisors, whose sum is σ = 12664544. Its totient is φ = 12664542.

The previous prime is 12664537. The next prime is 12664549. The reversal of 12664543 is 34546621.

It is a balanced prime because it is at equal distance from previous prime (12664537) and next prime (12664549).

It is a cyclic number.

It is not a de Polignac number, because 12664543 - 2⁵ = 12664511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12664549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6332271 + 6332272.

It is an arithmetic number, because the mean of its divisors is an integer number (6332272).

Almost surely, 2^12664543 is an apocalyptic number.

12664543 is a deficient number, since it is larger than the sum of its proper divisors (1).

12664543 is an equidigital number, since it uses as much as digits as its factorization.

12664543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 31.

The square root of 12664543 is about 3558.7277220940. The cubic root of 12664543 is about 233.0933271377.

The spelling of 12664543 in words is "twelve million, six hundred sixty-four thousand, five hundred forty-three".