667706159 has 2 divisors, whose sum is σ = 667706160. Its totient is φ = 667706158.

The previous prime is 667706153. The next prime is 667706167. The reversal of 667706159 is 951607766.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667706159 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667706153) 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, 333853079 + 333853080.

It is an arithmetic number, because the mean of its divisors is an integer number (333853080).

Almost surely, 2^667706159 is an apocalyptic number.

667706159 is a deficient number, since it is larger than the sum of its proper divisors (1).

667706159 is an equidigital number, since it uses as much as digits as its factorization.

667706159 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 476280, while the sum is 47.

The square root of 667706159 is about 25840.0108165612. The cubic root of 667706159 is about 874.0342690527.

The spelling of 667706159 in words is "six hundred sixty-seven million, seven hundred six thousand, one hundred fifty-nine".