1684854473257 has 2 divisors, whose sum is σ = 1684854473258. Its totient is φ = 1684854473256.

The previous prime is 1684854473243. The next prime is 1684854473327. The reversal of 1684854473257 is 7523744584861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1548061012521 + 136793460736 = 1244211^2 + 369856^2 .

It is an emirp because it is prime and its reverse (7523744584861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1684854473257 - 2¹⁹ = 1684853948969 is a prime.

It is not a weakly prime, because it can be changed into another prime (1684854473557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842427236628 + 842427236629.

It is an arithmetic number, because the mean of its divisors is an integer number (842427236629).

Almost surely, 2^{1684854473257} is an apocalyptic number.

It is an amenable number.

1684854473257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1684854473257 is an equidigital number, since it uses as much as digits as its factorization.

1684854473257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 180633600, while the sum is 64.

The spelling of 1684854473257 in words is "one trillion, six hundred eighty-four billion, eight hundred fifty-four million, four hundred seventy-three thousand, two hundred fifty-seven".