163743809861 has 2 divisors, whose sum is σ = 163743809862. Its totient is φ = 163743809860.

The previous prime is 163743809851. The next prime is 163743809893. The reversal of 163743809861 is 168908347361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116745905761 + 46997904100 = 341681^2 + 216790^2 .

It is a cyclic number.

It is not a de Polignac number, because 163743809861 - 2³⁰ = 162670068037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 163743809797 and 163743809806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163743809851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81871904930 + 81871904931.

It is an arithmetic number, because the mean of its divisors is an integer number (81871904931).

Almost surely, 2^163743809861 is an apocalyptic number.

It is an amenable number.

163743809861 is a deficient number, since it is larger than the sum of its proper divisors (1).

163743809861 is an equidigital number, since it uses as much as digits as its factorization.

163743809861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5225472, while the sum is 56.

The spelling of 163743809861 in words is "one hundred sixty-three billion, seven hundred forty-three million, eight hundred nine thousand, eight hundred sixty-one".