3866638666 has 16 divisors (see below), whose sum is σ = 6328250208. Its totient is φ = 1757278800.

The previous prime is 3866638637. The next prime is 3866638673. The reversal of 3866638666 is 6668366683.

It is a happy number.

3866638666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 3866638666.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190336 + ... + 209668.

It is an arithmetic number, because the mean of its divisors is an integer number (395515638).

Almost surely, 2^3866638666 is an apocalyptic number.

3866638666 is a deficient number, since it is larger than the sum of its proper divisors (2461611542).

3866638666 is a wasteful number, since it uses less digits than its factorization.

3866638666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28437.

The product of its digits is 26873856, while the sum is 58.

The square root of 3866638666 is about 62182.3018711916. The cubic root of 3866638666 is about 1569.5597865152.

The spelling of 3866638666 in words is "three billion, eight hundred sixty-six million, six hundred thirty-eight thousand, six hundred sixty-six".