640533430664311 has 2 divisors, whose sum is σ = 640533430664312. Its totient is φ = 640533430664310.

The previous prime is 640533430664293. The next prime is 640533430664377. The reversal of 640533430664311 is 113466034335046.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 640533430664311 - 2¹¹ = 640533430662263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640533430164311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320266715332155 + 320266715332156.

It is an arithmetic number, because the mean of its divisors is an integer number (320266715332156).

Almost surely, 2^{640533430664311} is an apocalyptic number.

640533430664311 is a deficient number, since it is larger than the sum of its proper divisors (1).

640533430664311 is an equidigital number, since it uses as much as digits as its factorization.

640533430664311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5598720, while the sum is 49.

Adding to 640533430664311 its reverse (113466034335046), we get a palindrome (753999464999357).

The spelling of 640533430664311 in words is "six hundred forty trillion, five hundred thirty-three billion, four hundred thirty million, six hundred sixty-four thousand, three hundred eleven".