664969379 has 2 divisors, whose sum is σ = 664969380. Its totient is φ = 664969378.

The previous prime is 664969343. The next prime is 664969387. The reversal of 664969379 is 973969466.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664969379 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (664069379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332484689 + 332484690.

It is an arithmetic number, because the mean of its divisors is an integer number (332484690).

Almost surely, 2^664969379 is an apocalyptic number.

664969379 is a deficient number, since it is larger than the sum of its proper divisors (1).

664969379 is an equidigital number, since it uses as much as digits as its factorization.

664969379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13226976, while the sum is 59.

The square root of 664969379 is about 25787.0001938961. Note that the first 3 decimals coincide. The cubic root of 664969379 is about 872.8384760211.

The spelling of 664969379 in words is "six hundred sixty-four million, nine hundred sixty-nine thousand, three hundred seventy-nine".