664562669 has 2 divisors, whose sum is σ = 664562670. Its totient is φ = 664562668.

The previous prime is 664562653. The next prime is 664562693. The reversal of 664562669 is 966265466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 384669769 + 279892900 = 19613^2 + 16730^2 .

It is a cyclic number.

It is not a de Polignac number, because 664562669 - 2⁴ = 664562653 is a prime.

It is a super-2 number, since 2×664562669² = 883287082056807122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664562629) 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, 332281334 + 332281335.

It is an arithmetic number, because the mean of its divisors is an integer number (332281335).

Almost surely, 2^664562669 is an apocalyptic number.

It is an amenable number.

664562669 is a deficient number, since it is larger than the sum of its proper divisors (1).

664562669 is an equidigital number, since it uses as much as digits as its factorization.

664562669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2799360, while the sum is 50.

The square root of 664562669 is about 25779.1130374961. The cubic root of 664562669 is about 872.6604906150.

The spelling of 664562669 in words is "six hundred sixty-four million, five hundred sixty-two thousand, six hundred sixty-nine".