664679387 has 2 divisors, whose sum is σ = 664679388. Its totient is φ = 664679386.

The previous prime is 664679383. The next prime is 664679417. The reversal of 664679387 is 783976466.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664679387 - 2² = 664679383 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (664679383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332339693 + 332339694.

It is an arithmetic number, because the mean of its divisors is an integer number (332339694).

Almost surely, 2^664679387 is an apocalyptic number.

664679387 is a deficient number, since it is larger than the sum of its proper divisors (1).

664679387 is an equidigital number, since it uses as much as digits as its factorization.

664679387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9144576, while the sum is 56.

The square root of 664679387 is about 25781.3767475672. The cubic root of 664679387 is about 872.7115764541.

The spelling of 664679387 in words is "six hundred sixty-four million, six hundred seventy-nine thousand, three hundred eighty-seven".