643346334244451 has 2 divisors, whose sum is σ = 643346334244452. Its totient is φ = 643346334244450.

The previous prime is 643346334244441. The next prime is 643346334244487. The reversal of 643346334244451 is 154442433643346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 643346334244451 - 2¹⁴ = 643346334228067 is a prime.

It is not a weakly prime, because it can be changed into another prime (643346334244441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321673167122225 + 321673167122226.

It is an arithmetic number, because the mean of its divisors is an integer number (321673167122226).

Almost surely, 2^{643346334244451} is an apocalyptic number.

643346334244451 is a deficient number, since it is larger than the sum of its proper divisors (1).

643346334244451 is an equidigital number, since it uses as much as digits as its factorization.

643346334244451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 119439360, while the sum is 56.

Adding to 643346334244451 its reverse (154442433643346), we get a palindrome (797788767887797).

The spelling of 643346334244451 in words is "six hundred forty-three trillion, three hundred forty-six billion, three hundred thirty-four million, two hundred forty-four thousand, four hundred fifty-one".