866739666 has 16 divisors (see below), whose sum is σ = 1866824064. Its totient is φ = 266689104.

The previous prime is 866739649. The next prime is 866739749. The reversal of 866739666 is 666937668.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5555946 + ... + 5556101.

It is an arithmetic number, because the mean of its divisors is an integer number (116676504).

Almost surely, 2^866739666 is an apocalyptic number.

866739666 is an abundant number, since it is smaller than the sum of its proper divisors (1000084398).

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

866739666 is a wasteful number, since it uses less digits than its factorization.

866739666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11112065.

The product of its digits is 11757312, while the sum is 57.

The square root of 866739666 is about 29440.4426936824. The cubic root of 866739666 is about 953.4462700844.

The spelling of 866739666 in words is "eight hundred sixty-six million, seven hundred thirty-nine thousand, six hundred sixty-six".