16866081 has 12 divisors (see below), whose sum is σ = 25202580. Its totient is φ = 10856160.

The previous prime is 16866067. The next prime is 16866097. The reversal of 16866081 is 18066861.

It can be written as a sum of positive squares in 2 ways, for example, as 3294225 + 13571856 = 1815^2 + 3684^2 .

It is not a de Polignac number, because 16866081 - 2⁵ = 16866049 is a prime.

It is a super-2 number, since 2×16866081² = 568929376597122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (16866001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32050 + ... + 32571.

It is an arithmetic number, because the mean of its divisors is an integer number (2100215).

Almost surely, 2^16866081 is an apocalyptic number.

It is an amenable number.

16866081 is a deficient number, since it is larger than the sum of its proper divisors (8336499).

16866081 is a wasteful number, since it uses less digits than its factorization.

16866081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64656 (or 64653 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 16866081 is about 4106.8334516997. The cubic root of 16866081 is about 256.4511950735.

The spelling of 16866081 in words is "sixteen million, eight hundred sixty-six thousand, eighty-one".