1685018518349 has 8 divisors (see below), whose sum is σ = 1736101340280. Its totient is φ = 1634650141696.

The previous prime is 1685018518327. The next prime is 1685018518357. The reversal of 1685018518349 is 9438158105861.

It can be written as a sum of positive squares in 4 ways, for example, as 507157622500 + 1177860895849 = 712150^2 + 1085293^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1685018518349 - 2³² = 1680723551053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1685018518319) 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 in 7 ways as a sum of consecutive naturals, for example, 178606532 + ... + 178615965.

It is an arithmetic number, because the mean of its divisors is an integer number (217012667535).

Almost surely, 2^{1685018518349} is an apocalyptic number.

It is an amenable number.

1685018518349 is a deficient number, since it is larger than the sum of its proper divisors (51082821931).

1685018518349 is an equidigital number, since it uses as much as digits as its factorization.

1685018518349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357222639.

The product of its (nonzero) digits is 8294400, while the sum is 59.

The spelling of 1685018518349 in words is "one trillion, six hundred eighty-five billion, eighteen million, five hundred eighteen thousand, three hundred forty-nine".