643063611629 has 2 divisors, whose sum is σ = 643063611630. Its totient is φ = 643063611628.

The previous prime is 643063611611. The next prime is 643063611667. The reversal of 643063611629 is 926116360346.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 419431093225 + 223632518404 = 647635^2 + 472898^2 .

It is a cyclic number.

It is not a de Polignac number, because 643063611629 - 2²⁸ = 642795176173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643063611689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321531805814 + 321531805815.

It is an arithmetic number, because the mean of its divisors is an integer number (321531805815).

Almost surely, 2^643063611629 is an apocalyptic number.

It is an amenable number.

643063611629 is a deficient number, since it is larger than the sum of its proper divisors (1).

643063611629 is an equidigital number, since it uses as much as digits as its factorization.

643063611629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 839808, while the sum is 47.

The spelling of 643063611629 in words is "six hundred forty-three billion, sixty-three million, six hundred eleven thousand, six hundred twenty-nine".