1685975680205 has 8 divisors (see below), whose sum is σ = 2025175947000. Its totient is φ = 1347443790336.

The previous prime is 1685975680133. The next prime is 1685975680231. The reversal of 1685975680205 is 5020865795861.

It can be written as a sum of positive squares in 4 ways, for example, as 4902660361 + 1681073019844 = 70019^2 + 1296562^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1685975680205 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167088680 + ... + 167098769.

It is an arithmetic number, because the mean of its divisors is an integer number (253146993375).

Almost surely, 2^{1685975680205} is an apocalyptic number.

It is an amenable number.

1685975680205 is a deficient number, since it is larger than the sum of its proper divisors (339200266795).

1685975680205 is a wasteful number, since it uses less digits than its factorization.

1685975680205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334188463.

The product of its (nonzero) digits is 36288000, while the sum is 62.

The spelling of 1685975680205 in words is "one trillion, six hundred eighty-five billion, nine hundred seventy-five million, six hundred eighty thousand, two hundred five".