664266167 has 2 divisors, whose sum is σ = 664266168. Its totient is φ = 664266166.

The previous prime is 664266157. The next prime is 664266203. The reversal of 664266167 is 761662466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664266167 - 2⁸ = 664265911 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 (664266137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332133083 + 332133084.

It is an arithmetic number, because the mean of its divisors is an integer number (332133084).

Almost surely, 2^664266167 is an apocalyptic number.

664266167 is a deficient number, since it is larger than the sum of its proper divisors (1).

664266167 is an equidigital number, since it uses as much as digits as its factorization.

664266167 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 44.

The square root of 664266167 is about 25773.3615774117. The cubic root of 664266167 is about 872.5306889258.

The spelling of 664266167 in words is "six hundred sixty-four million, two hundred sixty-six thousand, one hundred sixty-seven".