16616161 has 2 divisors, whose sum is σ = 16616162. Its totient is φ = 16616160.

The previous prime is 16616141. The next prime is 16616167. The reversal of 16616161 is 16161661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10144225 + 6471936 = 3185^2 + 2544^2 .

It is a cyclic number.

It is not a de Polignac number, because 16616161 - 2⁵ = 16616129 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16616167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8308080 + 8308081.

It is an arithmetic number, because the mean of its divisors is an integer number (8308081).

Almost surely, 2^16616161 is an apocalyptic number.

It is an amenable number.

16616161 is a deficient number, since it is larger than the sum of its proper divisors (1).

16616161 is an equidigital number, since it uses as much as digits as its factorization.

16616161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 28.

The square root of 16616161 is about 4076.2925557423. The cubic root of 16616161 is about 255.1781966039.

The spelling of 16616161 in words is "sixteen million, six hundred sixteen thousand, one hundred sixty-one".