6540316243 has 2 divisors, whose sum is σ = 6540316244. Its totient is φ = 6540316242.

The previous prime is 6540316217. The next prime is 6540316259. The reversal of 6540316243 is 3426130456.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6540316243 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6540316199 and 6540316208.

It is not a weakly prime, because it can be changed into another prime (6540316213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3270158121 + 3270158122.

It is an arithmetic number, because the mean of its divisors is an integer number (3270158122).

Almost surely, 2^6540316243 is an apocalyptic number.

6540316243 is a deficient number, since it is larger than the sum of its proper divisors (1).

6540316243 is an equidigital number, since it uses as much as digits as its factorization.

6540316243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 6540316243 is about 80872.2217018922. The cubic root of 6540316243 is about 1870.1061111110.

Adding to 6540316243 its reverse (3426130456), we get a palindrome (9966446699).

The spelling of 6540316243 in words is "six billion, five hundred forty million, three hundred sixteen thousand, two hundred forty-three".