643540045339 has 2 divisors, whose sum is σ = 643540045340. Its totient is φ = 643540045338.

The previous prime is 643540045327. The next prime is 643540045367. The reversal of 643540045339 is 933540045346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 643540045339 - 2³⁵ = 609180306971 is a prime.

It is not a weakly prime, because it can be changed into another prime (643540045399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321770022669 + 321770022670.

It is an arithmetic number, because the mean of its divisors is an integer number (321770022670).

Almost surely, 2^643540045339 is an apocalyptic number.

643540045339 is a deficient number, since it is larger than the sum of its proper divisors (1).

643540045339 is an equidigital number, since it uses as much as digits as its factorization.

643540045339 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2332800, while the sum is 46.

The spelling of 643540045339 in words is "six hundred forty-three billion, five hundred forty million, forty-five thousand, three hundred thirty-nine".