13545243352409 has 2 divisors, whose sum is σ = 13545243352410. Its totient is φ = 13545243352408.

The previous prime is 13545243352331. The next prime is 13545243352451. The reversal of 13545243352409 is 90425334254531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9481503432025 + 4063739920384 = 3079205^2 + 2015872^2 .

It is an emirp because it is prime and its reverse (90425334254531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13545243352409 - 2³² = 13540948385113 is a prime.

It is a super-2 number, since 2×13545243352409² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (13545243352499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6772621676204 + 6772621676205.

It is an arithmetic number, because the mean of its divisors is an integer number (6772621676205).

Almost surely, 2^{13545243352409} is an apocalyptic number.

It is an amenable number.

13545243352409 is a deficient number, since it is larger than the sum of its proper divisors (1).

13545243352409 is an equidigital number, since it uses as much as digits as its factorization.

13545243352409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776000, while the sum is 50.

The spelling of 13545243352409 in words is "thirteen trillion, five hundred forty-five billion, two hundred forty-three million, three hundred fifty-two thousand, four hundred nine".