664372717 has 2 divisors, whose sum is σ = 664372718. Its totient is φ = 664372716.

The previous prime is 664372697. The next prime is 664372727. The reversal of 664372717 is 717273466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 658127716 + 6245001 = 25654^2 + 2499^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664372717 is a prime.

It is a super-2 number, since 2×664372717² = 882782214187924178, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664372727) 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, 332186358 + 332186359.

It is an arithmetic number, because the mean of its divisors is an integer number (332186359).

Almost surely, 2^664372717 is an apocalyptic number.

It is an amenable number.

664372717 is a deficient number, since it is larger than the sum of its proper divisors (1).

664372717 is an equidigital number, since it uses as much as digits as its factorization.

664372717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 296352, while the sum is 43.

The square root of 664372717 is about 25775.4285512385. The cubic root of 664372717 is about 872.5773384865.

The spelling of 664372717 in words is "six hundred sixty-four million, three hundred seventy-two thousand, seven hundred seventeen".