667706167 has 2 divisors, whose sum is σ = 667706168. Its totient is φ = 667706166.

The previous prime is 667706159. The next prime is 667706173. The reversal of 667706167 is 761607766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667706167 - 2³ = 667706159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667706867) 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, 333853083 + 333853084.

It is an arithmetic number, because the mean of its divisors is an integer number (333853084).

Almost surely, 2^667706167 is an apocalyptic number.

667706167 is a deficient number, since it is larger than the sum of its proper divisors (1).

667706167 is an equidigital number, since it uses as much as digits as its factorization.

667706167 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 444528, while the sum is 46.

The square root of 667706167 is about 25840.0109713599. The cubic root of 667706167 is about 874.0342725434.

The spelling of 667706167 in words is "six hundred sixty-seven million, seven hundred six thousand, one hundred sixty-seven".