16660417 has 2 divisors, whose sum is σ = 16660418. Its totient is φ = 16660416.

The previous prime is 16660403. The next prime is 16660439. The reversal of 16660417 is 71406661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13868176 + 2792241 = 3724^2 + 1671^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16660417 is a prime.

It is a super-2 number, since 2×16660417² = 555138989227778, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16660447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8330208 + 8330209.

It is an arithmetic number, because the mean of its divisors is an integer number (8330209).

Almost surely, 2^16660417 is an apocalyptic number.

It is an amenable number.

16660417 is a deficient number, since it is larger than the sum of its proper divisors (1).

16660417 is an equidigital number, since it uses as much as digits as its factorization.

16660417 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 16660417 is about 4081.7174081506. The cubic root of 16660417 is about 255.4045456161.

The spelling of 16660417 in words is "sixteen million, six hundred sixty thousand, four hundred seventeen".