673556641409 has 2 divisors, whose sum is σ = 673556641410. Its totient is φ = 673556641408.

The previous prime is 673556641403. The next prime is 673556641421. The reversal of 673556641409 is 904146655376.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 550930609009 + 122626032400 = 742247^2 + 350180^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-673556641409 is a prime.

It is not a weakly prime, because it can be changed into another prime (673556641403) 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, 336778320704 + 336778320705.

It is an arithmetic number, because the mean of its divisors is an integer number (336778320705).

Almost surely, 2^673556641409 is an apocalyptic number.

It is an amenable number.

673556641409 is a deficient number, since it is larger than the sum of its proper divisors (1).

673556641409 is an equidigital number, since it uses as much as digits as its factorization.

673556641409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16329600, while the sum is 56.

The spelling of 673556641409 in words is "six hundred seventy-three billion, five hundred fifty-six million, six hundred forty-one thousand, four hundred nine".