643262663129 has 2 divisors, whose sum is σ = 643262663130. Its totient is φ = 643262663128.

The previous prime is 643262663117. The next prime is 643262663161. The reversal of 643262663129 is 921366262346.

643262663129 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 501762555904 + 141500107225 = 708352^2 + 376165^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643262663129 is a prime.

It is not a weakly prime, because it can be changed into another prime (643262663189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321631331564 + 321631331565.

It is an arithmetic number, because the mean of its divisors is an integer number (321631331565).

Almost surely, 2^643262663129 is an apocalyptic number.

It is an amenable number.

643262663129 is a deficient number, since it is larger than the sum of its proper divisors (1).

643262663129 is an equidigital number, since it uses as much as digits as its factorization.

643262663129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3359232, while the sum is 50.

The spelling of 643262663129 in words is "six hundred forty-three billion, two hundred sixty-two million, six hundred sixty-three thousand, one hundred twenty-nine".