1684854473557 has 2 divisors, whose sum is σ = 1684854473558. Its totient is φ = 1684854473556.

The previous prime is 1684854473551. The next prime is 1684854473639. The reversal of 1684854473557 is 7553744584861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 893420053681 + 791434419876 = 945209^2 + 889626^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1684854473557 is a prime.

It is a super-2 number, since 2×1684854473557² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1684854473492 and 1684854473501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1684854473551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842427236778 + 842427236779.

It is an arithmetic number, because the mean of its divisors is an integer number (842427236779).

Almost surely, 2^{1684854473557} is an apocalyptic number.

It is an amenable number.

1684854473557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1684854473557 is an equidigital number, since it uses as much as digits as its factorization.

1684854473557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 451584000, while the sum is 67.

The spelling of 1684854473557 in words is "one trillion, six hundred eighty-four billion, eight hundred fifty-four million, four hundred seventy-three thousand, five hundred fifty-seven".