16466561 has 2 divisors, whose sum is σ = 16466562. Its totient is φ = 16466560.

The previous prime is 16466531. The next prime is 16466563. The reversal of 16466561 is 16566461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14592400 + 1874161 = 3820^2 + 1369^2 .

It is a cyclic number.

It is not a de Polignac number, because 16466561 - 2¹⁴ = 16450177 is a prime.

It is a super-2 number, since 2×16466561² = 542295262333442, which contains 22 as substring.

Together with 16466563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16466563) 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, 8233280 + 8233281.

It is an arithmetic number, because the mean of its divisors is an integer number (8233281).

Almost surely, 2^16466561 is an apocalyptic number.

It is an amenable number.

16466561 is a deficient number, since it is larger than the sum of its proper divisors (1).

16466561 is an equidigital number, since it uses as much as digits as its factorization.

16466561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 35.

The square root of 16466561 is about 4057.9010584291. The cubic root of 16466561 is about 254.4100729187.

The spelling of 16466561 in words is "sixteen million, four hundred sixty-six thousand, five hundred sixty-one".