1685345873 has 2 divisors, whose sum is σ = 1685345874. Its totient is φ = 1685345872.

The previous prime is 1685345869. The next prime is 1685345891. The reversal of 1685345873 is 3785435861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1025472529 + 659873344 = 32023^2 + 25688^2 .

It is a cyclic number.

It is not a de Polignac number, because 1685345873 - 2² = 1685345869 is a prime.

It is not a weakly prime, because it can be changed into another prime (1685345833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842672936 + 842672937.

It is an arithmetic number, because the mean of its divisors is an integer number (842672937).

Almost surely, 2^1685345873 is an apocalyptic number.

It is an amenable number.

1685345873 is a deficient number, since it is larger than the sum of its proper divisors (1).

1685345873 is an equidigital number, since it uses as much as digits as its factorization.

1685345873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2419200, while the sum is 50.

The square root of 1685345873 is about 41052.9642413310. The cubic root of 1685345873 is about 1190.0439860869.

It can be divided in two parts, 16853 and 45873, that added together give a palindrome (62726).

The spelling of 1685345873 in words is "one billion, six hundred eighty-five million, three hundred forty-five thousand, eight hundred seventy-three".