684513396173 has 4 divisors (see below), whose sum is σ = 689437953120. Its totient is φ = 679588839228.

The previous prime is 684513396157. The next prime is 684513396187. The reversal of 684513396173 is 371693315486.

684513396173 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 371693315486 = 2 ⋅185846657743.

It is a cyclic number.

It is not a de Polignac number, because 684513396173 - 2⁴ = 684513396157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684513396103) 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, 2462278265 + ... + 2462278542.

It is an arithmetic number, because the mean of its divisors is an integer number (172359488280).

Almost surely, 2^684513396173 is an apocalyptic number.

It is an amenable number.

684513396173 is a deficient number, since it is larger than the sum of its proper divisors (4924556947).

684513396173 is a wasteful number, since it uses less digits than its factorization.

684513396173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4924556946.

The product of its digits is 9797760, while the sum is 56.

The spelling of 684513396173 in words is "six hundred eighty-four billion, five hundred thirteen million, three hundred ninety-six thousand, one hundred seventy-three".