1685368385 has 4 divisors (see below), whose sum is σ = 2022442068. Its totient is φ = 1348294704.

The previous prime is 1685368367. The next prime is 1685368387. The reversal of 1685368385 is 5838635861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5838635861 = 4813 ⋅1213097.

It can be written as a sum of positive squares in 2 ways, for example, as 424195216 + 1261173169 = 20596^2 + 35513^2 .

It is a cyclic number.

It is not a de Polignac number, because 1685368385 - 2¹⁶ = 1685302849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1685368387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168536834 + ... + 168536843.

It is an arithmetic number, because the mean of its divisors is an integer number (505610517).

Almost surely, 2^1685368385 is an apocalyptic number.

It is an amenable number.

1685368385 is a deficient number, since it is larger than the sum of its proper divisors (337073683).

1685368385 is an equidigital number, since it uses as much as digits as its factorization.

1685368385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337073682.

The product of its digits is 4147200, while the sum is 53.

The square root of 1685368385 is about 41053.2384228090. The cubic root of 1685368385 is about 1190.0492847323.

The spelling of 1685368385 in words is "one billion, six hundred eighty-five million, three hundred sixty-eight thousand, three hundred eighty-five".