643443303344417 has 2 divisors, whose sum is σ = 643443303344418. Its totient is φ = 643443303344416.

The previous prime is 643443303344341. The next prime is 643443303344437. The reversal of 643443303344417 is 714443303344346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 376189338151201 + 267253965193216 = 19395601^2 + 16347904^2 .

It is a cyclic number.

It is not a de Polignac number, because 643443303344417 - 2¹⁸ = 643443303082273 is a prime.

It is not a weakly prime, because it can be changed into another prime (643443303344437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321721651672208 + 321721651672209.

It is an arithmetic number, because the mean of its divisors is an integer number (321721651672209).

Almost surely, 2^{643443303344417} is an apocalyptic number.

It is an amenable number.

643443303344417 is a deficient number, since it is larger than the sum of its proper divisors (1).

643443303344417 is an equidigital number, since it uses as much as digits as its factorization.

643443303344417 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41803776, while the sum is 53.

The spelling of 643443303344417 in words is "six hundred forty-three trillion, four hundred forty-three billion, three hundred three million, three hundred forty-four thousand, four hundred seventeen".