666673297 has 2 divisors, whose sum is σ = 666673298. Its totient is φ = 666673296.

The previous prime is 666673277. The next prime is 666673361. The reversal of 666673297 is 792376666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 334012176 + 332661121 = 18276^2 + 18239^2 .

It is a cyclic number.

It is not a de Polignac number, because 666673297 - 2¹⁹ = 666149009 is a prime.

It is not a weakly prime, because it can be changed into another prime (666673277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333336648 + 333336649.

It is an arithmetic number, because the mean of its divisors is an integer number (333336649).

Almost surely, 2^666673297 is an apocalyptic number.

It is an amenable number.

666673297 is a deficient number, since it is larger than the sum of its proper divisors (1).

666673297 is an equidigital number, since it uses as much as digits as its factorization.

666673297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3429216, while the sum is 52.

The square root of 666673297 is about 25820.0173702498. The cubic root of 666673297 is about 873.5833607915.

The spelling of 666673297 in words is "six hundred sixty-six million, six hundred seventy-three thousand, two hundred ninety-seven".