1604499948809 has 2 divisors, whose sum is σ = 1604499948810. Its totient is φ = 1604499948808.

The previous prime is 1604499948739. The next prime is 1604499948811. The reversal of 1604499948809 is 9088499944061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1597182857209 + 7317091600 = 1263797^2 + 85540^2 .

It is a cyclic number.

It is not a de Polignac number, because 1604499948809 - 2⁸ = 1604499948553 is a prime.

It is a Sophie Germain prime.

Together with 1604499948811, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1604499945809) 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, 802249974404 + 802249974405.

It is an arithmetic number, because the mean of its divisors is an integer number (802249974405).

Almost surely, 2^{1604499948809} is an apocalyptic number.

It is an amenable number.

1604499948809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1604499948809 is an equidigital number, since it uses as much as digits as its factorization.

1604499948809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 161243136, while the sum is 71.

The spelling of 1604499948809 in words is "one trillion, six hundred four billion, four hundred ninety-nine million, nine hundred forty-eight thousand, eight hundred nine".