667634267 has 2 divisors, whose sum is σ = 667634268. Its totient is φ = 667634266.

The previous prime is 667634263. The next prime is 667634287. The reversal of 667634267 is 762436766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 667634267 - 2² = 667634263 is a prime.

It is not a weakly prime, because it can be changed into another prime (667634263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333817133 + 333817134.

It is an arithmetic number, because the mean of its divisors is an integer number (333817134).

Almost surely, 2^667634267 is an apocalyptic number.

667634267 is a deficient number, since it is larger than the sum of its proper divisors (1).

667634267 is an equidigital number, since it uses as much as digits as its factorization.

667634267 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1524096, while the sum is 47.

The square root of 667634267 is about 25838.6196806254. The cubic root of 667634267 is about 874.0028988029.

The spelling of 667634267 in words is "six hundred sixty-seven million, six hundred thirty-four thousand, two hundred sixty-seven".