664454969 has 2 divisors, whose sum is σ = 664454970. Its totient is φ = 664454968.

The previous prime is 664454941. The next prime is 664455007. The reversal of 664454969 is 969454466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 586220944 + 78234025 = 24212^2 + 8845^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664454969 is a prime.

It is a super-2 number, since 2×664454969² = 883000811657581922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 664454969.

It is not a weakly prime, because it can be changed into another prime (664454669) 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, 332227484 + 332227485.

It is an arithmetic number, because the mean of its divisors is an integer number (332227485).

Almost surely, 2^664454969 is an apocalyptic number.

It is an amenable number.

664454969 is a deficient number, since it is larger than the sum of its proper divisors (1).

664454969 is an equidigital number, since it uses as much as digits as its factorization.

664454969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5598720, while the sum is 53.

The square root of 664454969 is about 25777.0240524386. The cubic root of 664454969 is about 872.6133465222.

The spelling of 664454969 in words is "six hundred sixty-four million, four hundred fifty-four thousand, nine hundred sixty-nine".