2166228866 has 4 divisors (see below), whose sum is σ = 3249343302. Its totient is φ = 1083114432.

The previous prime is 2166228851. The next prime is 2166228887. The reversal of 2166228866 is 6688226612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2101764025 + 64464841 = 45845^2 + 8029^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2166228866.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 541557215 + ... + 541557218.

Almost surely, 2^2166228866 is an apocalyptic number.

2166228866 is a deficient number, since it is larger than the sum of its proper divisors (1083114436).

2166228866 is a wasteful number, since it uses less digits than its factorization.

2166228866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083114435.

The product of its digits is 663552, while the sum is 47.

The square root of 2166228866 is about 46542.7638414394. The cubic root of 2166228866 is about 1293.9021849464.

The spelling of 2166228866 in words is "two billion, one hundred sixty-six million, two hundred twenty-eight thousand, eight hundred sixty-six".