646432265138441 has 2 divisors, whose sum is σ = 646432265138442. Its totient is φ = 646432265138440.

The previous prime is 646432265138323. The next prime is 646432265138467. The reversal of 646432265138441 is 144831562234646.

646432265138441 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 435087660150025 + 211344604988416 = 20858755^2 + 14537696^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646432265138441 is a prime.

It is not a weakly prime, because it can be changed into another prime (646432265134441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323216132569220 + 323216132569221.

It is an arithmetic number, because the mean of its divisors is an integer number (323216132569221).

Almost surely, 2^{646432265138441} is an apocalyptic number.

It is an amenable number.

646432265138441 is a deficient number, since it is larger than the sum of its proper divisors (1).

646432265138441 is an equidigital number, since it uses as much as digits as its factorization.

646432265138441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 79626240, while the sum is 59.

The spelling of 646432265138441 in words is "six hundred forty-six trillion, four hundred thirty-two billion, two hundred sixty-five million, one hundred thirty-eight thousand, four hundred forty-one".