4066543266509 has 2 divisors, whose sum is σ = 4066543266510. Its totient is φ = 4066543266508.

The previous prime is 4066543266407. The next prime is 4066543266529. The reversal of 4066543266509 is 9056623456604.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3013296733225 + 1053246533284 = 1735885^2 + 1026278^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4066543266509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4066543266529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2033271633254 + 2033271633255.

It is an arithmetic number, because the mean of its divisors is an integer number (2033271633255).

Almost surely, 2^{4066543266509} is an apocalyptic number.

It is an amenable number.

4066543266509 is a deficient number, since it is larger than the sum of its proper divisors (1).

4066543266509 is an equidigital number, since it uses as much as digits as its factorization.

4066543266509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27993600, while the sum is 56.

The spelling of 4066543266509 in words is "four trillion, sixty-six billion, five hundred forty-three million, two hundred sixty-six thousand, five hundred nine".