6665051666 has 16 divisors (see below), whose sum is σ = 12304711104. Its totient is φ = 2636723664.

The previous prime is 6665051651. The next prime is 6665051707. The reversal of 6665051666 is 6661505666.

It is a self number, because there is not a number n which added to its sum of digits gives 6665051666.

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, 18310400 + ... + 18310763.

It is an arithmetic number, because the mean of its divisors is an integer number (769044444).

Almost surely, 2^6665051666 is an apocalyptic number.

6665051666 is a deficient number, since it is larger than the sum of its proper divisors (5639659438).

6665051666 is a wasteful number, since it uses less digits than its factorization.

6665051666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36621185.

The product of its (nonzero) digits is 1166400, while the sum is 47.

The square root of 6665051666 is about 81639.7676748287. The cubic root of 6665051666 is about 1881.9200681068.

The spelling of 6665051666 in words is "six billion, six hundred sixty-five million, fifty-one thousand, six hundred sixty-six".