161644163 has 2 divisors, whose sum is σ = 161644164. Its totient is φ = 161644162.

The previous prime is 161644123. The next prime is 161644169. The reversal of 161644163 is 361446161.

161644163 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161644163 - 2⁸ = 161643907 is a prime.

It is a super-2 number, since 2×161644163² = 52257670863941138, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161644169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80822081 + 80822082.

It is an arithmetic number, because the mean of its divisors is an integer number (80822082).

Almost surely, 2^161644163 is an apocalyptic number.

161644163 is a deficient number, since it is larger than the sum of its proper divisors (1).

161644163 is an equidigital number, since it uses as much as digits as its factorization.

161644163 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 32.

The square root of 161644163 is about 12713.9357792935. The cubic root of 161644163 is about 544.7367502309.

The spelling of 161644163 in words is "one hundred sixty-one million, six hundred forty-four thousand, one hundred sixty-three".