643425062243 has 2 divisors, whose sum is σ = 643425062244. Its totient is φ = 643425062242.

The previous prime is 643425062191. The next prime is 643425062251. The reversal of 643425062243 is 342260524346.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 643425062243 - 2¹⁸ = 643424800099 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 643425062243.

It is not a weakly prime, because it can be changed into another prime (643425062143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321712531121 + 321712531122.

It is an arithmetic number, because the mean of its divisors is an integer number (321712531122).

Almost surely, 2^643425062243 is an apocalyptic number.

643425062243 is a deficient number, since it is larger than the sum of its proper divisors (1).

643425062243 is an equidigital number, since it uses as much as digits as its factorization.

643425062243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 829440, while the sum is 41.

Adding to 643425062243 its reverse (342260524346), we get a palindrome (985685586589).

The spelling of 643425062243 in words is "six hundred forty-three billion, four hundred twenty-five million, sixty-two thousand, two hundred forty-three".