16566081 has 16 divisors (see below), whose sum is σ = 26572800. Its totient is φ = 8967888.

The previous prime is 16566073. The next prime is 16566083. The reversal of 16566081 is 18066561.

It is not a de Polignac number, because 16566081 - 2³ = 16566073 is a prime.

It is a super-2 number, since 2×16566081² = 548870079397122, which contains 22 as substring.

It is a Curzon number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (16566083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20361 + ... + 21158.

It is an arithmetic number, because the mean of its divisors is an integer number (1660800).

Almost surely, 2^16566081 is an apocalyptic number.

It is an amenable number.

16566081 is a deficient number, since it is larger than the sum of its proper divisors (10006719).

16566081 is a wasteful number, since it uses less digits than its factorization.

16566081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41548.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 16566081 is about 4070.1450834092. The cubic root of 16566081 is about 254.9215752680.

The spelling of 16566081 in words is "sixteen million, five hundred sixty-six thousand, eighty-one".