10666681 has 4 divisors (see below), whose sum is σ = 10695652. Its totient is φ = 10637712.

The previous prime is 10666679. The next prime is 10666699. The reversal of 10666681 is 18666601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18666601 = 43 ⋅434107.

It can be written as a sum of positive squares in 2 ways, for example, as 9000000 + 1666681 = 3000^2 + 1291^2 .

It is a cyclic number.

It is not a de Polignac number, because 10666681 - 2¹ = 10666679 is a prime.

It is a super-2 number, since 2×10666681² = 227556167111522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10676681) 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 in 3 ways as a sum of consecutive naturals, for example, 13926 + ... + 14671.

It is an arithmetic number, because the mean of its divisors is an integer number (2673913).

Almost surely, 2^10666681 is an apocalyptic number.

It is an amenable number.

10666681 is a deficient number, since it is larger than the sum of its proper divisors (28971).

10666681 is an equidigital number, since it uses as much as digits as its factorization.

10666681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28970.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 10666681 is about 3265.9885180447. The cubic root of 10666681 is about 220.1285818588.

The spelling of 10666681 in words is "ten million, six hundred sixty-six thousand, six hundred eighty-one".