664324897 has 2 divisors, whose sum is σ = 664324898. Its totient is φ = 664324896.

The previous prime is 664324891. The next prime is 664324909. The reversal of 664324897 is 798423466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 461433361 + 202891536 = 21481^2 + 14244^2 .

It is a cyclic number.

It is not a de Polignac number, because 664324897 - 2⁷ = 664324769 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 664324897.

It is not a weakly prime, because it can be changed into another prime (664324891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332162448 + 332162449.

It is an arithmetic number, because the mean of its divisors is an integer number (332162449).

Almost surely, 2^664324897 is an apocalyptic number.

It is an amenable number.

664324897 is a deficient number, since it is larger than the sum of its proper divisors (1).

664324897 is an equidigital number, since it uses as much as digits as its factorization.

664324897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 49.

The square root of 664324897 is about 25774.5009069041. The cubic root of 664324897 is about 872.5564026230.

The spelling of 664324897 in words is "six hundred sixty-four million, three hundred twenty-four thousand, eight hundred ninety-seven".