1673721323713 has 2 divisors, whose sum is σ = 1673721323714. Its totient is φ = 1673721323712.

The previous prime is 1673721323663. The next prime is 1673721323731. The reversal of 1673721323713 is 3173231273761.

It is a happy number.

Together with next prime (1673721323731) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1638417920049 + 35303403664 = 1280007^2 + 187892^2 .

It is an emirp because it is prime and its reverse (3173231273761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1673721323713 - 2²¹ = 1673719226561 is a prime.

It is a super-2 number, since 2×1673721323713² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1673721323213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 836860661856 + 836860661857.

It is an arithmetic number, because the mean of its divisors is an integer number (836860661857).

Almost surely, 2^{1673721323713} is an apocalyptic number.

It is an amenable number.

1673721323713 is a deficient number, since it is larger than the sum of its proper divisors (1).

1673721323713 is an equidigital number, since it uses as much as digits as its factorization.

1673721323713 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 666792, while the sum is 46.

The spelling of 1673721323713 in words is "one trillion, six hundred seventy-three billion, seven hundred twenty-one million, three hundred twenty-three thousand, seven hundred thirteen".