643426050263 has 2 divisors, whose sum is σ = 643426050264. Its totient is φ = 643426050262.

The previous prime is 643426050251. The next prime is 643426050299. The reversal of 643426050263 is 362050624346.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643426050263 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 643426050263.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643426050763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321713025131 + 321713025132.

It is an arithmetic number, because the mean of its divisors is an integer number (321713025132).

Almost surely, 2^643426050263 is an apocalyptic number.

643426050263 is a deficient number, since it is larger than the sum of its proper divisors (1).

643426050263 is an equidigital number, since it uses as much as digits as its factorization.

643426050263 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 41.

The spelling of 643426050263 in words is "six hundred forty-three billion, four hundred twenty-six million, fifty thousand, two hundred sixty-three".