2187866666 has 8 divisors (see below), whose sum is σ = 3301452000. Its totient is φ = 1087382668.

The previous prime is 2187866657. The next prime is 2187866669. The reversal of 2187866666 is 6666687812.

It is a happy number.

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

2187866666 is a modest number, since divided by 66666 gives 21878 as remainder.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2187866669) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 3274916 + ... + 3275583.

It is an arithmetic number, because the mean of its divisors is an integer number (412681500).

Almost surely, 2^2187866666 is an apocalyptic number.

2187866666 is a deficient number, since it is larger than the sum of its proper divisors (1113585334).

2187866666 is a wasteful number, since it uses less digits than its factorization.

2187866666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6550668.

The product of its digits is 6967296, while the sum is 56.

The square root of 2187866666 is about 46774.6369948501. The cubic root of 2187866666 is about 1298.1960513552.

The spelling of 2187866666 in words is "two billion, one hundred eighty-seven million, eight hundred sixty-six thousand, six hundred sixty-six".