664982497 has 2 divisors, whose sum is σ = 664982498. Its totient is φ = 664982496.

The previous prime is 664982443. The next prime is 664982503. The reversal of 664982497 is 794289466.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 531256401 + 133726096 = 23049^2 + 11564^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664982497 is a prime.

It is not a weakly prime, because it can be changed into another prime (664983497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332491248 + 332491249.

It is an arithmetic number, because the mean of its divisors is an integer number (332491249).

Almost surely, 2^664982497 is an apocalyptic number.

It is an amenable number.

664982497 is a deficient number, since it is larger than the sum of its proper divisors (1).

664982497 is an equidigital number, since it uses as much as digits as its factorization.

664982497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5225472, while the sum is 55.

The square root of 664982497 is about 25787.2545456084. The cubic root of 664982497 is about 872.8442155435.

The spelling of 664982497 in words is "six hundred sixty-four million, nine hundred eighty-two thousand, four hundred ninety-seven".