643351334543 has 2 divisors, whose sum is σ = 643351334544. Its totient is φ = 643351334542.

The previous prime is 643351334539. The next prime is 643351334569. The reversal of 643351334543 is 345433153346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 643351334543 - 2² = 643351334539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 643351334494 and 643351334503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643351334503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321675667271 + 321675667272.

It is an arithmetic number, because the mean of its divisors is an integer number (321675667272).

Almost surely, 2^643351334543 is an apocalyptic number.

643351334543 is a deficient number, since it is larger than the sum of its proper divisors (1).

643351334543 is an equidigital number, since it uses as much as digits as its factorization.

643351334543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2332800, while the sum is 44.

Adding to 643351334543 its reverse (345433153346), we get a palindrome (988784487889).

The spelling of 643351334543 in words is "six hundred forty-three billion, three hundred fifty-one million, three hundred thirty-four thousand, five hundred forty-three".