8666861 has 8 divisors (see below), whose sum is σ = 9984000. Its totient is φ = 7369488.

The previous prime is 8666849. The next prime is 8666863. The reversal of 8666861 is 1686668.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8666861 - 2⁶ = 8666797 is a prime.

It is a super-2 number, since 2×8666861² = 150228959186642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8666863) 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 7 ways as a sum of consecutive naturals, for example, 3986 + ... + 5763.

It is an arithmetic number, because the mean of its divisors is an integer number (1248000).

Almost surely, 2^8666861 is an apocalyptic number.

It is an amenable number.

8666861 is a deficient number, since it is larger than the sum of its proper divisors (1317139).

8666861 is a wasteful number, since it uses less digits than its factorization.

8666861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9883.

The product of its digits is 82944, while the sum is 41.

The square root of 8666861 is about 2943.9532944665. The cubic root of 8666861 is about 205.4095402067.

The spelling of 8666861 in words is "eight million, six hundred sixty-six thousand, eight hundred sixty-one".