666759 has 8 divisors (see below), whose sum is σ = 904320. Its totient is φ = 436856.

The previous prime is 666751. The next prime is 666769. The reversal of 666759 is 957666.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 666759 - 2³ = 666751 is a prime.

666759 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1707 + ... + 2060.

It is an arithmetic number, because the mean of its divisors is an integer number (113040).

2⁶⁶⁶⁷⁵⁹ is an apocalyptic number.

666759 is a deficient number, since it is larger than the sum of its proper divisors (237561).

666759 is a wasteful number, since it uses less digits than its factorization.

666759 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3829.

The product of its digits is 68040, while the sum is 39.

The square root of 666759 is about 816.5531213583. The cubic root of 666759 is about 87.3620793173.

The spelling of 666759 in words is "six hundred sixty-six thousand, seven hundred fifty-nine".