667665067 has 2 divisors, whose sum is σ = 667665068. Its totient is φ = 667665066.

The previous prime is 667665059. The next prime is 667665077. The reversal of 667665067 is 760566766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 667665067 - 2³ = 667665059 is a prime.

It is a super-2 number, since 2×667665067² = 891553283384228978, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 667665067.

It is not a weakly prime, because it can be changed into another prime (667665077) 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, 333832533 + 333832534.

It is an arithmetic number, because the mean of its divisors is an integer number (333832534).

Almost surely, 2^667665067 is an apocalyptic number.

667665067 is a deficient number, since it is larger than the sum of its proper divisors (1).

667665067 is an equidigital number, since it uses as much as digits as its factorization.

667665067 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1905120, while the sum is 49.

The square root of 667665067 is about 25839.2156808213. The cubic root of 667665067 is about 874.0163387339.

The spelling of 667665067 in words is "six hundred sixty-seven million, six hundred sixty-five thousand, sixty-seven".