666749267 has 2 divisors, whose sum is σ = 666749268. Its totient is φ = 666749266.

The previous prime is 666749243. The next prime is 666749309. The reversal of 666749267 is 762947666.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666749267 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (666749467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333374633 + 333374634.

It is an arithmetic number, because the mean of its divisors is an integer number (333374634).

Almost surely, 2^666749267 is an apocalyptic number.

666749267 is a deficient number, since it is larger than the sum of its proper divisors (1).

666749267 is an equidigital number, since it uses as much as digits as its factorization.

666749267 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4572288, while the sum is 53.

The square root of 666749267 is about 25821.4884737499. The cubic root of 666749267 is about 873.6165422651.

The spelling of 666749267 in words is "six hundred sixty-six million, seven hundred forty-nine thousand, two hundred sixty-seven".