161563163 has 2 divisors, whose sum is σ = 161563164. Its totient is φ = 161563162.

The previous prime is 161563159. The next prime is 161563231. The reversal of 161563163 is 361365161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161563163 - 2² = 161563159 is a prime.

It is a super-2 number, since 2×161563163² = 52205311277129138, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161563123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80781581 + 80781582.

It is an arithmetic number, because the mean of its divisors is an integer number (80781582).

Almost surely, 2^161563163 is an apocalyptic number.

161563163 is a deficient number, since it is larger than the sum of its proper divisors (1).

161563163 is an equidigital number, since it uses as much as digits as its factorization.

161563163 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 32.

The square root of 161563163 is about 12710.7498991995. The cubic root of 161563163 is about 544.6457457098.

The spelling of 161563163 in words is "one hundred sixty-one million, five hundred sixty-three thousand, one hundred sixty-three".