673684773409 has 4 divisors (see below), whose sum is σ = 673695118404. Its totient is φ = 673674428416.

The previous prime is 673684773407. The next prime is 673684773431. The reversal of 673684773409 is 904377486376.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 560282190400 + 113402583009 = 748520^2 + 336753^2 .

It is a cyclic number.

It is not a de Polignac number, because 673684773409 - 2¹ = 673684773407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (673684773407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5074192 + ... + 5205265.

It is an arithmetic number, because the mean of its divisors is an integer number (168423779601).

Almost surely, 2^673684773409 is an apocalyptic number.

It is an amenable number.

673684773409 is a deficient number, since it is larger than the sum of its proper divisors (10344995).

673684773409 is a wasteful number, since it uses less digits than its factorization.

673684773409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10344994.

The product of its (nonzero) digits is 128024064, while the sum is 64.

The spelling of 673684773409 in words is "six hundred seventy-three billion, six hundred eighty-four million, seven hundred seventy-three thousand, four hundred nine".