1664748317 has 2 divisors, whose sum is σ = 1664748318. Its totient is φ = 1664748316.

The previous prime is 1664748313. The next prime is 1664748343. The reversal of 1664748317 is 7138474661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1341683641 + 323064676 = 36629^2 + 17974^2 .

It is an emirp because it is prime and its reverse (7138474661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1664748317 - 2² = 1664748313 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1664748313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832374158 + 832374159.

It is an arithmetic number, because the mean of its divisors is an integer number (832374159).

Almost surely, 2^1664748317 is an apocalyptic number.

It is an amenable number.

1664748317 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664748317 is an equidigital number, since it uses as much as digits as its factorization.

1664748317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 677376, while the sum is 47.

The square root of 1664748317 is about 40801.3273926229. The cubic root of 1664748317 is about 1185.1760358513.

The spelling of 1664748317 in words is "one billion, six hundred sixty-four million, seven hundred forty-eight thousand, three hundred seventeen".