673447313281 has 16 divisors (see below), whose sum is σ = 690505942608. Its totient is φ = 656667648000.

The previous prime is 673447313251. The next prime is 673447313347. The reversal of 673447313281 is 182313744376.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 4390387600 + 669056925681 = 66260^2 + 817959^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-673447313281 is a prime.

It is a super-2 number, since 2×673447313281² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (673447313251) 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, 1603921 + ... + 1979761.

It is an arithmetic number, because the mean of its divisors is an integer number (43156621413).

Almost surely, 2^673447313281 is an apocalyptic number.

It is an amenable number.

673447313281 is a deficient number, since it is larger than the sum of its proper divisors (17058629327).

673447313281 is a wasteful number, since it uses less digits than its factorization.

673447313281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376212.

The product of its digits is 2032128, while the sum is 49.

The spelling of 673447313281 in words is "six hundred seventy-three billion, four hundred forty-seven million, three hundred thirteen thousand, two hundred eighty-one".