163816712724991 has 2 divisors, whose sum is σ = 163816712724992. Its totient is φ = 163816712724990.

The previous prime is 163816712724983. The next prime is 163816712725027. The reversal of 163816712724991 is 199427217618361.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 163816712724991 - 2³ = 163816712724983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163816712724911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81908356362495 + 81908356362496.

It is an arithmetic number, because the mean of its divisors is an integer number (81908356362496).

Almost surely, 2^{163816712724991} is an apocalyptic number.

163816712724991 is a deficient number, since it is larger than the sum of its proper divisors (1).

163816712724991 is an equidigital number, since it uses as much as digits as its factorization.

163816712724991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54867456, while the sum is 67.

The spelling of 163816712724991 in words is "one hundred sixty-three trillion, eight hundred sixteen billion, seven hundred twelve million, seven hundred twenty-four thousand, nine hundred ninety-one".