687673334305 has 4 divisors (see below), whose sum is σ = 825208001172. Its totient is φ = 550138667440.

The previous prime is 687673334281. The next prime is 687673334323. The reversal of 687673334305 is 503433376786.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 503433376786 = 2 ⋅251716688393.

It can be written as a sum of positive squares in 2 ways, for example, as 413850329344 + 273823004961 = 643312^2 + 523281^2 .

It is not a de Polignac number, because 687673334305 - 2²¹ = 687671237153 is a prime.

It is a super-2 number, since 2×687673334305² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68767333426 + ... + 68767333435.

It is an arithmetic number, because the mean of its divisors is an integer number (206302000293).

Almost surely, 2^687673334305 is an apocalyptic number.

It is an amenable number.

687673334305 is a deficient number, since it is larger than the sum of its proper divisors (137534666867).

687673334305 is a wasteful number, since it uses less digits than its factorization.

687673334305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137534666866.

The product of its (nonzero) digits is 22861440, while the sum is 55.

The spelling of 687673334305 in words is "six hundred eighty-seven billion, six hundred seventy-three million, three hundred thirty-four thousand, three hundred five".