673821912729 has 16 divisors (see below), whose sum is σ = 1037361573248. Its totient is φ = 381071596032.

The previous prime is 673821912719. The next prime is 673821912761. The reversal of 673821912729 is 927219128376.

It is a happy number.

It is not a de Polignac number, because 673821912729 - 2¹³ = 673821904537 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (673821912719) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165393622 + ... + 165397695.

It is an arithmetic number, because the mean of its divisors is an integer number (64835098328).

Almost surely, 2^673821912729 is an apocalyptic number.

It is an amenable number.

673821912729 is a deficient number, since it is larger than the sum of its proper divisors (363539660519).

673821912729 is a wasteful number, since it uses less digits than its factorization.

673821912729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330791424.

The product of its digits is 4572288, while the sum is 57.

The spelling of 673821912729 in words is "six hundred seventy-three billion, eight hundred twenty-one million, nine hundred twelve thousand, seven hundred twenty-nine".