1664360329 has 2 divisors, whose sum is σ = 1664360330. Its totient is φ = 1664360328.

The previous prime is 1664360263. The next prime is 1664360353. The reversal of 1664360329 is 9230634661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1430881929 + 233478400 = 37827^2 + 15280^2 .

It is an emirp because it is prime and its reverse (9230634661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1664360329 - 2¹⁷ = 1664229257 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1664360291 and 1664360300.

It is not a weakly prime, because it can be changed into another prime (1664361329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832180164 + 832180165.

It is an arithmetic number, because the mean of its divisors is an integer number (832180165).

Almost surely, 2^1664360329 is an apocalyptic number.

It is an amenable number.

1664360329 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664360329 is an equidigital number, since it uses as much as digits as its factorization.

1664360329 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 40.

The square root of 1664360329 is about 40796.5725153474. The cubic root of 1664360329 is about 1185.0839559049.

The spelling of 1664360329 in words is "one billion, six hundred sixty-four million, three hundred sixty thousand, three hundred twenty-nine".