1685606125825 has 6 divisors (see below), whose sum is σ = 2090151596054. Its totient is φ = 1348484900640.

The previous prime is 1685606125817. The next prime is 1685606125829. The reversal of 1685606125825 is 5285216065861.

It can be written as a sum of positive squares in 3 ways, for example, as 20948799169 + 1664657326656 = 144737^2 + 1290216^2 .

It is not a de Polignac number, because 1685606125825 - 2³ = 1685606125817 is a prime.

It is a super-2 number, since 2×1685606125825² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1685606125829) 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 5 ways as a sum of consecutive naturals, for example, 33712122492 + ... + 33712122541.

Almost surely, 2^{1685606125825} is an apocalyptic number.

It is an amenable number.

1685606125825 is a deficient number, since it is larger than the sum of its proper divisors (404545470229).

1685606125825 is an equidigital number, since it uses as much as digits as its factorization.

1685606125825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67424245043 (or 67424245038 counting only the distinct ones).

The product of its (nonzero) digits is 6912000, while the sum is 55.

The spelling of 1685606125825 in words is "one trillion, six hundred eighty-five billion, six hundred six million, one hundred twenty-five thousand, eight hundred twenty-five".