1728744458849 has 2 divisors, whose sum is σ = 1728744458850. Its totient is φ = 1728744458848.

The previous prime is 1728744458843. The next prime is 1728744458893. The reversal of 1728744458849 is 9488544478271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1124168231824 + 604576227025 = 1060268^2 + 777545^2 .

It is a cyclic number.

It is not a de Polignac number, because 1728744458849 - 2⁸ = 1728744458593 is a prime.

It is a super-2 number, since 2×1728744458849² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1728744458843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 864372229424 + 864372229425.

It is an arithmetic number, because the mean of its divisors is an integer number (864372229425).

Almost surely, 2^{1728744458849} is an apocalyptic number.

It is an amenable number.

1728744458849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1728744458849 is an equidigital number, since it uses as much as digits as its factorization.

1728744458849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 578027520, while the sum is 71.

The spelling of 1728744458849 in words is "one trillion, seven hundred twenty-eight billion, seven hundred forty-four million, four hundred fifty-eight thousand, eight hundred forty-nine".