866181668 has 12 divisors (see below), whose sum is σ = 1653619632. Its totient is φ = 393718920.

The previous prime is 866181661. The next prime is 866181683.

It is a happy number.

866181668 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (866181661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9842930 + ... + 9843017.

It is an arithmetic number, because the mean of its divisors is an integer number (137801636).

Almost surely, 2^866181668 is an apocalyptic number.

It is an amenable number.

866181668 is a deficient number, since it is larger than the sum of its proper divisors (787437964).

866181668 is a wasteful number, since it uses less digits than its factorization.

866181668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19685962 (or 19685960 counting only the distinct ones).

The product of its digits is 663552, while the sum is 50.

The square root of 866181668 is about 29430.9644422333. The cubic root of 866181668 is about 953.2416198903.

The spelling of 866181668 in words is "eight hundred sixty-six million, one hundred eighty-one thousand, six hundred sixty-eight".