643072570561 has 2 divisors, whose sum is σ = 643072570562. Its totient is φ = 643072570560.

The previous prime is 643072570549. The next prime is 643072570571. The reversal of 643072570561 is 165075270346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 341266272400 + 301806298161 = 584180^2 + 549369^2 .

It is a cyclic number.

It is not a de Polignac number, because 643072570561 - 2⁵ = 643072570529 is a prime.

It is a super-3 number, since 3×643072570561³ (a number of 36 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (643072570571) 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, 321536285280 + 321536285281.

It is an arithmetic number, because the mean of its divisors is an integer number (321536285281).

Almost surely, 2^643072570561 is an apocalyptic number.

It is an amenable number.

643072570561 is a deficient number, since it is larger than the sum of its proper divisors (1).

643072570561 is an equidigital number, since it uses as much as digits as its factorization.

643072570561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1058400, while the sum is 46.

The spelling of 643072570561 in words is "six hundred forty-three billion, seventy-two million, five hundred seventy thousand, five hundred sixty-one".