664801297 has 2 divisors, whose sum is σ = 664801298. Its totient is φ = 664801296.

The previous prime is 664801283. The next prime is 664801301. The reversal of 664801297 is 792108466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 662753536 + 2047761 = 25744^2 + 1431^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664801297 is a prime.

It is not a weakly prime, because it can be changed into another prime (664801217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332400648 + 332400649.

It is an arithmetic number, because the mean of its divisors is an integer number (332400649).

Almost surely, 2^664801297 is an apocalyptic number.

It is an amenable number.

664801297 is a deficient number, since it is larger than the sum of its proper divisors (1).

664801297 is an equidigital number, since it uses as much as digits as its factorization.

664801297 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 664801297 is about 25783.7409426949. The cubic root of 664801297 is about 872.7649283741.

The spelling of 664801297 in words is "six hundred sixty-four million, eight hundred one thousand, two hundred ninety-seven".