1685168329 has 4 divisors (see below), whose sum is σ = 1814796676. Its totient is φ = 1555539984.

The previous prime is 1685168321. The next prime is 1685168341. The reversal of 1685168329 is 9238615861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9238615861 = 7883 ⋅1171967.

It can be written as a sum of positive squares in 2 ways, for example, as 931775625 + 753392704 = 30525^2 + 27448^2 .

It is a cyclic number.

It is not a de Polignac number, because 1685168329 - 2³ = 1685168321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1685168321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64814154 + ... + 64814179.

It is an arithmetic number, because the mean of its divisors is an integer number (453699169).

Almost surely, 2^1685168329 is an apocalyptic number.

It is an amenable number.

1685168329 is a deficient number, since it is larger than the sum of its proper divisors (129628347).

1685168329 is a wasteful number, since it uses less digits than its factorization.

1685168329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129628346.

The product of its digits is 622080, while the sum is 49.

The square root of 1685168329 is about 41050.8018070293. The cubic root of 1685168329 is about 1190.0021959331.

The spelling of 1685168329 in words is "one billion, six hundred eighty-five million, one hundred sixty-eight thousand, three hundred twenty-nine".