664153717 has 2 divisors, whose sum is σ = 664153718. Its totient is φ = 664153716.

The previous prime is 664153709. The next prime is 664153733. The reversal of 664153717 is 717351466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 644448996 + 19704721 = 25386^2 + 4439^2 .

It is a cyclic number.

It is not a de Polignac number, because 664153717 - 2³ = 664153709 is a prime.

It is a super-2 number, since 2×664153717² = 882200319609832178, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 664153717.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664150717) 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, 332076858 + 332076859.

It is an arithmetic number, because the mean of its divisors is an integer number (332076859).

Almost surely, 2^664153717 is an apocalyptic number.

It is an amenable number.

664153717 is a deficient number, since it is larger than the sum of its proper divisors (1).

664153717 is an equidigital number, since it uses as much as digits as its factorization.

664153717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105840, while the sum is 40.

The square root of 664153717 is about 25771.1799691050. The cubic root of 664153717 is about 872.4814508253.

The spelling of 664153717 in words is "six hundred sixty-four million, one hundred fifty-three thousand, seven hundred seventeen".