16662169 has 2 divisors, whose sum is σ = 16662170. Its totient is φ = 16662168.

The previous prime is 16662161. The next prime is 16662179. The reversal of 16662169 is 96126661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9072144 + 7590025 = 3012^2 + 2755^2 .

It is an emirp because it is prime and its reverse (96126661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16662169 - 2³ = 16662161 is a prime.

It is a super-2 number, since 2×16662169² = 555255751569122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16662161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8331084 + 8331085.

It is an arithmetic number, because the mean of its divisors is an integer number (8331085).

Almost surely, 2^16662169 is an apocalyptic number.

It is an amenable number.

16662169 is a deficient number, since it is larger than the sum of its proper divisors (1).

16662169 is an equidigital number, since it uses as much as digits as its factorization.

16662169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 37.

The square root of 16662169 is about 4081.9320180522. The cubic root of 16662169 is about 255.4134980347.

It can be divided in two parts, 1666216 and 9, that added together give a triangular number (1666225 = T₁₈₂₅).

The spelling of 16662169 in words is "sixteen million, six hundred sixty-two thousand, one hundred sixty-nine".