16163681 has 2 divisors, whose sum is σ = 16163682. Its totient is φ = 16163680.

The previous prime is 16163663. The next prime is 16163689. The reversal of 16163681 is 18636161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15673681 + 490000 = 3959^2 + 700^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16163681 is a prime.

It is a super-2 number, since 2×16163681² = 522529166939522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16163689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8081840 + 8081841.

It is an arithmetic number, because the mean of its divisors is an integer number (8081841).

Almost surely, 2^16163681 is an apocalyptic number.

It is an amenable number.

16163681 is a deficient number, since it is larger than the sum of its proper divisors (1).

16163681 is an equidigital number, since it uses as much as digits as its factorization.

16163681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 32.

The square root of 16163681 is about 4020.4080638662. The cubic root of 16163681 is about 252.8405677916.

The spelling of 16163681 in words is "sixteen million, one hundred sixty-three thousand, six hundred eighty-one".