81066 has 16 divisors (see below), whose sum is σ = 165600. Its totient is φ = 26448.

The previous prime is 81049. The next prime is 81071. The reversal of 81066 is 66018.

It is an unprimeable number.

81066 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240 + ... + 468.

It is an arithmetic number, because the mean of its divisors is an integer number (10350).

2⁸¹⁰⁶⁶ is an apocalyptic number.

81066 is an abundant number, since it is smaller than the sum of its proper divisors (84534).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82800).

81066 is a wasteful number, since it uses less digits than its factorization.

81066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 81066 is about 284.7209159862. The cubic root of 81066 is about 43.2792355820.

The spelling of 81066 in words is "eighty-one thousand, sixty-six".