666676 has 6 divisors (see below), whose sum is σ = 1166690. Its totient is φ = 333336.

The previous prime is 666671. The next prime is 666683. The reversal of 666676 is 676666.

It can be written as a sum of positive squares in only one way, i.e., 599076 + 67600 = 774^2 + 260^2 .

It is a nialpdrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666671) by changing a digit.

666676 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, 83331 + ... + 83338.

2⁶⁶⁶⁶⁷⁶ is an apocalyptic number.

It is an amenable number.

666676 is a deficient number, since it is larger than the sum of its proper divisors (500014).

666676 is a wasteful number, since it uses less digits than its factorization.

666676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166673 (or 166671 counting only the distinct ones).

The product of its digits is 54432, while the sum is 37.

The square root of 666676 is about 816.5022963838. The cubic root of 666676 is about 87.3584541426.

The spelling of 666676 in words is "six hundred sixty-six thousand, six hundred seventy-six".