1684854473209 has 2 divisors, whose sum is σ = 1684854473210. Its totient is φ = 1684854473208.

The previous prime is 1684854473059. The next prime is 1684854473213. The reversal of 1684854473209 is 9023744584861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1329012397584 + 355842075625 = 1152828^2 + 596525^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1684854473209 is a prime.

It is not a weakly prime, because it can be changed into another prime (1684854474209) 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 as a sum of consecutive naturals, namely, 842427236604 + 842427236605.

It is an arithmetic number, because the mean of its divisors is an integer number (842427236605).

It is a 1-persistent number, because it is pandigital, but 2⋅1684854473209 = 3369708946418 is not.

Almost surely, 2^{1684854473209} is an apocalyptic number.

It is an amenable number.

1684854473209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1684854473209 is an equidigital number, since it uses as much as digits as its factorization.

1684854473209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46448640, while the sum is 61.

The spelling of 1684854473209 in words is "one trillion, six hundred eighty-four billion, eight hundred fifty-four million, four hundred seventy-three thousand, two hundred nine".