1664870297 has 2 divisors, whose sum is σ = 1664870298. Its totient is φ = 1664870296.

The previous prime is 1664870293. The next prime is 1664870327. The reversal of 1664870297 is 7920784661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1405950016 + 258920281 = 37496^2 + 16091^2 .

It is a cyclic number.

It is not a de Polignac number, because 1664870297 - 2² = 1664870293 is a prime.

It is not a weakly prime, because it can be changed into another prime (1664870293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832435148 + 832435149.

It is an arithmetic number, because the mean of its divisors is an integer number (832435149).

Almost surely, 2^1664870297 is an apocalyptic number.

It is an amenable number.

1664870297 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664870297 is an equidigital number, since it uses as much as digits as its factorization.

1664870297 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1016064, while the sum is 50.

The square root of 1664870297 is about 40802.8221695510. The cubic root of 1664870297 is about 1185.2049820171.

The spelling of 1664870297 in words is "one billion, six hundred sixty-four million, eight hundred seventy thousand, two hundred ninety-seven".