1640326335773 has 2 divisors, whose sum is σ = 1640326335774. Its totient is φ = 1640326335772.

The previous prime is 1640326335743. The next prime is 1640326335793. The reversal of 1640326335773 is 3775336230461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1630940988889 + 9385346884 = 1277083^2 + 96878^2 .

It is an emirp because it is prime and its reverse (3775336230461) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1640326335773 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1640326335743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820163167886 + 820163167887.

It is an arithmetic number, because the mean of its divisors is an integer number (820163167887).

Almost surely, 2^{1640326335773} is an apocalyptic number.

It is an amenable number.

1640326335773 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640326335773 is an equidigital number, since it uses as much as digits as its factorization.

1640326335773 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5715360, while the sum is 50.

The spelling of 1640326335773 in words is "one trillion, six hundred forty billion, three hundred twenty-six million, three hundred thirty-five thousand, seven hundred seventy-three".