643306462517 has 2 divisors, whose sum is σ = 643306462518. Its totient is φ = 643306462516.

The previous prime is 643306462483. The next prime is 643306462529. The reversal of 643306462517 is 715264603346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 488833095556 + 154473366961 = 699166^2 + 393031^2 .

It is a cyclic number.

It is not a de Polignac number, because 643306462517 - 2⁶ = 643306462453 is a prime.

It is a super-2 number, since 2×643306462517² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643306462537) 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, 321653231258 + 321653231259.

It is an arithmetic number, because the mean of its divisors is an integer number (321653231259).

Almost surely, 2^643306462517 is an apocalyptic number.

It is an amenable number.

643306462517 is a deficient number, since it is larger than the sum of its proper divisors (1).

643306462517 is an equidigital number, since it uses as much as digits as its factorization.

643306462517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2177280, while the sum is 47.

The spelling of 643306462517 in words is "six hundred forty-three billion, three hundred six million, four hundred sixty-two thousand, five hundred seventeen".