16581066 has 8 divisors (see below), whose sum is σ = 33162144. Its totient is φ = 5527020.

The previous prime is 16581049. The next prime is 16581067. The reversal of 16581066 is 66018561.

16581066 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

16581066 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16581067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1381750 + ... + 1381761.

It is an arithmetic number, because the mean of its divisors is an integer number (4145268).

Almost surely, 2^16581066 is an apocalyptic number.

16581066 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16581066 is a wasteful number, since it uses less digits than its factorization.

16581066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2763516.

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

The square root of 16581066 is about 4071.9855107797. The cubic root of 16581066 is about 254.9984159840.

The spelling of 16581066 in words is "sixteen million, five hundred eighty-one thousand, sixty-six".