6665750666 has 16 divisors (see below), whose sum is σ = 10020913056. Its totient is φ = 3325456176.

The previous prime is 6665750657. The next prime is 6665750713. The reversal of 6665750666 is 6660575666.

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, 2689820 + ... + 2692296.

It is an arithmetic number, because the mean of its divisors is an integer number (626307066).

Almost surely, 2^6665750666 is an apocalyptic number.

6665750666 is a deficient number, since it is larger than the sum of its proper divisors (3355162390).

6665750666 is a wasteful number, since it uses less digits than its factorization.

6665750666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4933.

The product of its (nonzero) digits is 8164800, while the sum is 53.

The square root of 6665750666 is about 81644.0485644851. The cubic root of 6665750666 is about 1881.9858548509.

The spelling of 6665750666 in words is "six billion, six hundred sixty-five million, seven hundred fifty thousand, six hundred sixty-six".