1809063949697 has 2 divisors, whose sum is σ = 1809063949698. Its totient is φ = 1809063949696.

The previous prime is 1809063949687. The next prime is 1809063949711. The reversal of 1809063949697 is 7969493609081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1670442511936 + 138621437761 = 1292456^2 + 372319^2 .

It is a cyclic number.

It is not a de Polignac number, because 1809063949697 - 2¹⁰ = 1809063948673 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1809063949697.

It is not a weakly prime, because it can be changed into another prime (1809063949687) 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, 904531974848 + 904531974849.

It is an arithmetic number, because the mean of its divisors is an integer number (904531974849).

Almost surely, 2^{1809063949697} is an apocalyptic number.

It is an amenable number.

1809063949697 is a deficient number, since it is larger than the sum of its proper divisors (1).

1809063949697 is an equidigital number, since it uses as much as digits as its factorization.

1809063949697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 158723712, while the sum is 71.

The spelling of 1809063949697 in words is "one trillion, eight hundred nine billion, sixty-three million, nine hundred forty-nine thousand, six hundred ninety-seven".