2166666886 has 8 divisors (see below), whose sum is σ = 3325581864. Its totient is φ = 1058139600.

The previous prime is 2166666857. The next prime is 2166666893. The reversal of 2166666886 is 6886666612.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12596815 + ... + 12596986.

It is an arithmetic number, because the mean of its divisors is an integer number (415697733).

Almost surely, 2^2166666886 is an apocalyptic number.

2166666886 is a deficient number, since it is larger than the sum of its proper divisors (1158914978).

2166666886 is a wasteful number, since it uses less digits than its factorization.

2166666886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25193846.

The product of its digits is 5971968, while the sum is 55.

The square root of 2166666886 is about 46547.4691685810. The cubic root of 2166666886 is about 1293.9893897732.

The spelling of 2166666886 in words is "two billion, one hundred sixty-six million, six hundred sixty-six thousand, eight hundred eighty-six".