861060666 has 16 divisors (see below), whose sum is σ = 1724184000. Its totient is φ = 286676448.

The previous prime is 861060647. The next prime is 861060667. The reversal of 861060666 is 666060168.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (861060667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80491 + ... + 90558.

It is an arithmetic number, because the mean of its divisors is an integer number (107761500).

Almost surely, 2^861060666 is an apocalyptic number.

861060666 is an abundant number, since it is smaller than the sum of its proper divisors (863123334).

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

861060666 is a wasteful number, since it uses less digits than its factorization.

861060666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171893.

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 861060666 is about 29343.8352299082. The cubic root of 861060666 is about 951.3593341785.

The spelling of 861060666 in words is "eight hundred sixty-one million, sixty thousand, six hundred sixty-six".