1685606125829 has 2 divisors, whose sum is σ = 1685606125830. Its totient is φ = 1685606125828.

The previous prime is 1685606125817. The next prime is 1685606125871. The reversal of 1685606125829 is 9285216065861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1685595873025 + 10252804 = 1298305^2 + 3202^2 .

It is an emirp because it is prime and its reverse (9285216065861) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1685606125829 is a prime.

It is a super-2 number, since 2×1685606125829² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1685606325829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842803062914 + 842803062915.

It is an arithmetic number, because the mean of its divisors is an integer number (842803062915).

Almost surely, 2^{1685606125829} is an apocalyptic number.

It is an amenable number.

1685606125829 is a deficient number, since it is larger than the sum of its proper divisors (1).

1685606125829 is an equidigital number, since it uses as much as digits as its factorization.

1685606125829 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12441600, while the sum is 59.

The spelling of 1685606125829 in words is "one trillion, six hundred eighty-five billion, six hundred six million, one hundred twenty-five thousand, eight hundred twenty-nine".