643505115329 has 2 divisors, whose sum is σ = 643505115330. Its totient is φ = 643505115328.

The previous prime is 643505115317. The next prime is 643505115373. The reversal of 643505115329 is 923511505346.

It is an a-pointer prime, because the next prime (643505115373) can be obtained adding 643505115329 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 322877377729 + 320627737600 = 568223^2 + 566240^2 .

It is a cyclic number.

It is not a de Polignac number, because 643505115329 - 2³² = 639210148033 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 643505115329.

It is not a weakly prime, because it can be changed into another prime (643505118329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321752557664 + 321752557665.

It is an arithmetic number, because the mean of its divisors is an integer number (321752557665).

Almost surely, 2^643505115329 is an apocalyptic number.

It is an amenable number.

643505115329 is a deficient number, since it is larger than the sum of its proper divisors (1).

643505115329 is an equidigital number, since it uses as much as digits as its factorization.

643505115329 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486000, while the sum is 44.

The spelling of 643505115329 in words is "six hundred forty-three billion, five hundred five million, one hundred fifteen thousand, three hundred twenty-nine".