1685185168517 has 4 divisors (see below), whose sum is σ = 1688419689516. Its totient is φ = 1681950647520.

The previous prime is 1685185168507. The next prime is 1685185168523. The reversal of 1685185168517 is 7158615815861.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 683996815681 + 1001188352836 = 827041^2 + 1000594^2 .

It is a cyclic number.

It is not a de Polignac number, because 1685185168517 - 2³⁴ = 1668005299333 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1685185168517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1685185168507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1617259718 + ... + 1617260759.

It is an arithmetic number, because the mean of its divisors is an integer number (422104922379).

Almost surely, 2^{1685185168517} is an apocalyptic number.

It is an amenable number.

1685185168517 is a deficient number, since it is larger than the sum of its proper divisors (3234520999).

1685185168517 is an equidigital number, since it uses as much as digits as its factorization.

1685185168517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3234520998.

The product of its digits is 16128000, while the sum is 62.

The spelling of 1685185168517 in words is "one trillion, six hundred eighty-five billion, one hundred eighty-five million, one hundred sixty-eight thousand, five hundred seventeen".