643324245331 has 2 divisors, whose sum is σ = 643324245332. Its totient is φ = 643324245330.

The previous prime is 643324245301. The next prime is 643324245391. The reversal of 643324245331 is 133542423346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 643324245331 - 2¹⁹ = 643323721043 is a prime.

It is a super-2 number, since 2×643324245331² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (643324245301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321662122665 + 321662122666.

It is an arithmetic number, because the mean of its divisors is an integer number (321662122666).

Almost surely, 2^643324245331 is an apocalyptic number.

643324245331 is a deficient number, since it is larger than the sum of its proper divisors (1).

643324245331 is an equidigital number, since it uses as much as digits as its factorization.

643324245331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 40.

Adding to 643324245331 its reverse (133542423346), we get a palindrome (776866668677).

The spelling of 643324245331 in words is "six hundred forty-three billion, three hundred twenty-four million, two hundred forty-five thousand, three hundred thirty-one".