65820647243999 has 2 divisors, whose sum is σ = 65820647244000. Its totient is φ = 65820647243998.

The previous prime is 65820647243947. The next prime is 65820647244013. The reversal of 65820647243999 is 99934274602856.

65820647243999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65820647243999 - 2¹⁶ = 65820647178463 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65820647249999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32910323621999 + 32910323622000.

It is an arithmetic number, because the mean of its divisors is an integer number (32910323622000).

Almost surely, 2^{65820647243999} is an apocalyptic number.

65820647243999 is a deficient number, since it is larger than the sum of its proper divisors (1).

65820647243999 is an equidigital number, since it uses as much as digits as its factorization.

65820647243999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1410877440, while the sum is 74.

The spelling of 65820647243999 in words is "sixty-five trillion, eight hundred twenty billion, six hundred forty-seven million, two hundred forty-three thousand, nine hundred ninety-nine".