664666967 has 2 divisors, whose sum is σ = 664666968. Its totient is φ = 664666966.

The previous prime is 664666963. The next prime is 664666993. The reversal of 664666967 is 769666466.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664666967 - 2² = 664666963 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 (664666963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332333483 + 332333484.

It is an arithmetic number, because the mean of its divisors is an integer number (332333484).

Almost surely, 2^664666967 is an apocalyptic number.

664666967 is a deficient number, since it is larger than the sum of its proper divisors (1).

664666967 is an equidigital number, since it uses as much as digits as its factorization.

664666967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11757312, while the sum is 56.

The square root of 664666967 is about 25781.1358748989. The cubic root of 664666967 is about 872.7061406779.

The spelling of 664666967 in words is "six hundred sixty-four million, six hundred sixty-six thousand, nine hundred sixty-seven".