866066 has 4 divisors (see below), whose sum is σ = 1299102. Its totient is φ = 433032.

The previous prime is 866057. The next prime is 866081. The reversal of 866066 is 660668.

It is a happy number.

866066 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 863041 + 3025 = 929^2 + 55^2 .

It is an unprimeable number.

866066 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 as a sum of consecutive naturals, namely, 216515 + ... + 216518.

2⁸⁶⁶⁰⁶⁶ is an apocalyptic number.

866066 is a deficient number, since it is larger than the sum of its proper divisors (433036).

866066 is a wasteful number, since it uses less digits than its factorization.

866066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433035.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 866066 is about 930.6266705828. The cubic root of 866066 is about 95.3199186736.

The spelling of 866066 in words is "eight hundred sixty-six thousand, sixty-six".