1683641211809 has 2 divisors, whose sum is σ = 1683641211810. Its totient is φ = 1683641211808.

The previous prime is 1683641211799. The next prime is 1683641211817. The reversal of 1683641211809 is 9081121463861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 859277088784 + 824364123025 = 926972^2 + 907945^2 .

It is a cyclic number.

It is not a de Polignac number, because 1683641211809 - 2¹⁶ = 1683641146273 is a prime.

It is not a weakly prime, because it can be changed into another prime (1683641211829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 841820605904 + 841820605905.

It is an arithmetic number, because the mean of its divisors is an integer number (841820605905).

Almost surely, 2^{1683641211809} is an apocalyptic number.

It is an amenable number.

1683641211809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1683641211809 is an equidigital number, since it uses as much as digits as its factorization.

1683641211809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 497664, while the sum is 50.

The spelling of 1683641211809 in words is "one trillion, six hundred eighty-three billion, six hundred forty-one million, two hundred eleven thousand, eight hundred nine".