643244542363 has 2 divisors, whose sum is σ = 643244542364. Its totient is φ = 643244542362.

The previous prime is 643244542361. The next prime is 643244542417. The reversal of 643244542363 is 363245442346.

643244542363 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 is a cyclic number.

It is not a de Polignac number, because 643244542363 - 2¹ = 643244542361 is a prime.

Together with 643244542361, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (643244542361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321622271181 + 321622271182.

It is an arithmetic number, because the mean of its divisors is an integer number (321622271182).

Almost surely, 2^643244542363 is an apocalyptic number.

643244542363 is a deficient number, since it is larger than the sum of its proper divisors (1).

643244542363 is an equidigital number, since it uses as much as digits as its factorization.

643244542363 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4976640, while the sum is 46.

The spelling of 643244542363 in words is "six hundred forty-three billion, two hundred forty-four million, five hundred forty-two thousand, three hundred sixty-three".