866171712 has 112 divisors (see below), whose sum is σ = 2658506240. Its totient is φ = 243758592.

The previous prime is 866171711. The next prime is 866171749. The reversal of 866171712 is 217171668.

It is a tau number, because it is divible by the number of its divisors (112).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866171711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85239 + ... + 94857.

Almost surely, 2^866171712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866171712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1329253120).

866171712 is an abundant number, since it is smaller than the sum of its proper divisors (1792334528).

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

866171712 is a wasteful number, since it uses less digits than its factorization.

866171712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9708 (or 9698 counting only the distinct ones).

The product of its digits is 28224, while the sum is 39.

The square root of 866171712 is about 29430.7953001614. The cubic root of 866171712 is about 953.2379676504.

It can be divided in two parts, 866 and 171712, that added together give a triangular number (172578 = T₅₈₇).

The spelling of 866171712 in words is "eight hundred sixty-six million, one hundred seventy-one thousand, seven hundred twelve".