641004561473 has 2 divisors, whose sum is σ = 641004561474. Its totient is φ = 641004561472.

The previous prime is 641004561433. The next prime is 641004561479. The reversal of 641004561473 is 374165400146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 403399008769 + 237605552704 = 635137^2 + 487448^2 .

It is a cyclic number.

It is not a de Polignac number, because 641004561473 - 2¹⁸ = 641004299329 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 641004561473.

It is not a weakly prime, because it can be changed into another prime (641004561479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320502280736 + 320502280737.

It is an arithmetic number, because the mean of its divisors is an integer number (320502280737).

Almost surely, 2^641004561473 is an apocalyptic number.

It is an amenable number.

641004561473 is a deficient number, since it is larger than the sum of its proper divisors (1).

641004561473 is an equidigital number, since it uses as much as digits as its factorization.

641004561473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 41.

The spelling of 641004561473 in words is "six hundred forty-one billion, four million, five hundred sixty-one thousand, four hundred seventy-three".