643321829831347 has 2 divisors, whose sum is σ = 643321829831348. Its totient is φ = 643321829831346.

The previous prime is 643321829831341. The next prime is 643321829831381. The reversal of 643321829831347 is 743138928123346.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643321829831347 is a prime.

It is not a weakly prime, because it can be changed into another prime (643321829831341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321660914915673 + 321660914915674.

It is an arithmetic number, because the mean of its divisors is an integer number (321660914915674).

Almost surely, 2^{643321829831347} is an apocalyptic number.

643321829831347 is a deficient number, since it is larger than the sum of its proper divisors (1).

643321829831347 is an equidigital number, since it uses as much as digits as its factorization.

643321829831347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 125411328, while the sum is 64.

The spelling of 643321829831347 in words is "six hundred forty-three trillion, three hundred twenty-one billion, eight hundred twenty-nine million, eight hundred thirty-one thousand, three hundred forty-seven".