2081666866 has 8 divisors (see below), whose sum is σ = 3286842480. Its totient is φ = 986052708.

The previous prime is 2081666837. The next prime is 2081666869. The reversal of 2081666866 is 6686661802.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (2081666869) 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 3 ways as a sum of consecutive naturals, for example, 27390316 + ... + 27390391.

It is an arithmetic number, because the mean of its divisors is an integer number (410855310).

Almost surely, 2^2081666866 is an apocalyptic number.

2081666866 is a deficient number, since it is larger than the sum of its proper divisors (1205175614).

2081666866 is a wasteful number, since it uses less digits than its factorization.

2081666866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54780728.

The product of its (nonzero) digits is 995328, while the sum is 49.

The square root of 2081666866 is about 45625.2875716965. The cubic root of 2081666866 is about 1276.8417552457.

The spelling of 2081666866 in words is "two billion, eighty-one million, six hundred sixty-six thousand, eight hundred sixty-six".