2666816 has 14 divisors (see below), whose sum is σ = 5292090. Its totient is φ = 1333376.

The previous prime is 2666809. The next prime is 2666819. The reversal of 2666816 is 6186662.

It can be written as a sum of positive squares in only one way, i.e., 1849600 + 817216 = 1360^2 + 904^2 .

It is a super-2 number, since 2×2666816² = 14223815155712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2666819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20771 + ... + 20898.

2^2666816 is an apocalyptic number.

It is an amenable number.

2666816 is a deficient number, since it is larger than the sum of its proper divisors (2625274).

2666816 is an equidigital number, since it uses as much as digits as its factorization.

2666816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41681 (or 41671 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 2666816 is about 1633.0388850239. The cubic root of 2666816 is about 138.6748433706.

The spelling of 2666816 in words is "two million, six hundred sixty-six thousand, eight hundred sixteen".