666672673 has 2 divisors, whose sum is σ = 666672674. Its totient is φ = 666672672.

The previous prime is 666672661. The next prime is 666672707. The reversal of 666672673 is 376276666.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 333537169 + 333135504 = 18263^2 + 18252^2 .

It is a cyclic number.

It is not a de Polignac number, because 666672673 - 2⁹ = 666672161 is a prime.

It is not a weakly prime, because it can be changed into another prime (666672613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333336336 + 333336337.

It is an arithmetic number, because the mean of its divisors is an integer number (333336337).

Almost surely, 2^666672673 is an apocalyptic number.

It is an amenable number.

666672673 is a deficient number, since it is larger than the sum of its proper divisors (1).

666672673 is an equidigital number, since it uses as much as digits as its factorization.

666672673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2286144, while the sum is 49.

The square root of 666672673 is about 25820.0052865990. The cubic root of 666672673 is about 873.5830882362.

The spelling of 666672673 in words is "six hundred sixty-six million, six hundred seventy-two thousand, six hundred seventy-three".