666716 has 6 divisors (see below), whose sum is σ = 1166760. Its totient is φ = 333356.

The previous prime is 666707. The next prime is 666727. The reversal of 666716 is 617666.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 666716.

It is an unprimeable number.

666716 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83336 + ... + 83343.

It is an arithmetic number, because the mean of its divisors is an integer number (194460).

2⁶⁶⁶⁷¹⁶ is an apocalyptic number.

It is an amenable number.

666716 is a deficient number, since it is larger than the sum of its proper divisors (500044).

666716 is a wasteful number, since it uses less digits than its factorization.

666716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166683 (or 166681 counting only the distinct ones).

The product of its digits is 9072, while the sum is 32.

The square root of 666716 is about 816.5267907423. The cubic root of 666716 is about 87.3602012523.

The spelling of 666716 in words is "six hundred sixty-six thousand, seven hundred sixteen".