181616163 has 8 divisors (see below), whose sum is σ = 245769408. Its totient is φ = 119270184.

The previous prime is 181616153. The next prime is 181616167. The reversal of 181616163 is 361616181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 181616163 - 2¹⁶ = 181550627 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (181616167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 451581 + ... + 451982.

It is an arithmetic number, because the mean of its divisors is an integer number (30721176).

Almost surely, 2^181616163 is an apocalyptic number.

181616163 is a deficient number, since it is larger than the sum of its proper divisors (64153245).

181616163 is an equidigital number, since it uses as much as digits as its factorization.

181616163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 903633.

The product of its digits is 5184, while the sum is 33.

The square root of 181616163 is about 13476.5041090039. The cubic root of 181616163 is about 566.3064377568.

The spelling of 181616163 in words is "one hundred eighty-one million, six hundred sixteen thousand, one hundred sixty-three".