687505408361 has 8 divisors (see below), whose sum is σ = 706436780040. Its totient is φ = 668592465408.

The previous prime is 687505408357. The next prime is 687505408463. The reversal of 687505408361 is 163804505786.

It can be written as a sum of positive squares in 4 ways, for example, as 377172852736 + 310332555625 = 614144^2 + 557075^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 687505408361 - 2² = 687505408357 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687505408351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4531526 + ... + 4680783.

It is an arithmetic number, because the mean of its divisors is an integer number (88304597505).

Almost surely, 2^687505408361 is an apocalyptic number.

It is an amenable number.

687505408361 is a deficient number, since it is larger than the sum of its proper divisors (18931371679).

687505408361 is a wasteful number, since it uses less digits than its factorization.

687505408361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9214363.

The product of its (nonzero) digits is 4838400, while the sum is 53.

The spelling of 687505408361 in words is "six hundred eighty-seven billion, five hundred five million, four hundred eight thousand, three hundred sixty-one".