1664582317 has 2 divisors, whose sum is σ = 1664582318. Its totient is φ = 1664582316.

The previous prime is 1664582263. The next prime is 1664582327. The reversal of 1664582317 is 7132854661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1441796841 + 222785476 = 37971^2 + 14926^2 .

It is a cyclic number.

It is not a de Polignac number, because 1664582317 - 2⁷ = 1664582189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1664582327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832291158 + 832291159.

It is an arithmetic number, because the mean of its divisors is an integer number (832291159).

Almost surely, 2^1664582317 is an apocalyptic number.

It is an amenable number.

1664582317 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664582317 is an equidigital number, since it uses as much as digits as its factorization.

1664582317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 43.

The square root of 1664582317 is about 40799.2930943662. The cubic root of 1664582317 is about 1185.1366413556.

The spelling of 1664582317 in words is "one billion, six hundred sixty-four million, five hundred eighty-two thousand, three hundred seventeen".