1685606125817 has 2 divisors, whose sum is σ = 1685606125818. Its totient is φ = 1685606125816.

The previous prime is 1685606125811. The next prime is 1685606125829. The reversal of 1685606125817 is 7185216065861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1648614912256 + 36991213561 = 1283984^2 + 192331^2 .

It is a cyclic number.

It is not a de Polignac number, because 1685606125817 - 2¹² = 1685606121721 is a prime.

It is a super-2 number, since 2×1685606125817² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1685606125811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842803062908 + 842803062909.

It is an arithmetic number, because the mean of its divisors is an integer number (842803062909).

Almost surely, 2^{1685606125817} is an apocalyptic number.

It is an amenable number.

1685606125817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1685606125817 is an equidigital number, since it uses as much as digits as its factorization.

1685606125817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4838400, while the sum is 56.

The spelling of 1685606125817 in words is "one trillion, six hundred eighty-five billion, six hundred six million, one hundred twenty-five thousand, eight hundred seventeen".