666746 has 8 divisors (see below), whose sum is σ = 1003860. Its totient is φ = 332128.

The previous prime is 666737. The next prime is 666749. The reversal of 666746 is 647666.

666746 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 657721 + 9025 = 811^2 + 95^2 .

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

It is not an unprimeable number, because it can be changed into a prime (666749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 350 + ... + 1206.

2⁶⁶⁶⁷⁴⁶ is an apocalyptic number.

666746 is a deficient number, since it is larger than the sum of its proper divisors (337114).

666746 is a wasteful number, since it uses less digits than its factorization.

666746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1248.

The product of its digits is 36288, while the sum is 35.

The square root of 666746 is about 816.5451610291. The cubic root of 666746 is about 87.3615115387.

The spelling of 666746 in words is "six hundred sixty-six thousand, seven hundred forty-six".