866601 has 6 divisors (see below), whose sum is σ = 1251770. Its totient is φ = 577728.

The previous prime is 866581. The next prime is 866623. The reversal of 866601 is 106668.

866601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 767376 + 99225 = 876^2 + 315^2 .

It is not a de Polignac number, because 866601 - 2¹⁰ = 865577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 48136 + ... + 48153.

2⁸⁶⁶⁶⁰¹ is an apocalyptic number.

It is an amenable number.

866601 is a deficient number, since it is larger than the sum of its proper divisors (385169).

866601 is a wasteful number, since it uses less digits than its factorization.

866601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96295 (or 96292 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 866601 is about 930.9140669256. The cubic root of 866601 is about 95.3395421432.

The spelling of 866601 in words is "eight hundred sixty-six thousand, six hundred one".