163491799673 has 2 divisors, whose sum is σ = 163491799674. Its totient is φ = 163491799672.

The previous prime is 163491799649. The next prime is 163491799703. The reversal of 163491799673 is 376997194361.

163491799673 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111959167609 + 51532632064 = 334603^2 + 227008^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163491799673 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (163491799643) 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, 81745899836 + 81745899837.

It is an arithmetic number, because the mean of its divisors is an integer number (81745899837).

Almost surely, 2^163491799673 is an apocalyptic number.

It is an amenable number.

163491799673 is a deficient number, since it is larger than the sum of its proper divisors (1).

163491799673 is an equidigital number, since it uses as much as digits as its factorization.

163491799673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46294416, while the sum is 65.

The spelling of 163491799673 in words is "one hundred sixty-three billion, four hundred ninety-one million, seven hundred ninety-nine thousand, six hundred seventy-three".