687639321559 has 4 divisors (see below), whose sum is σ = 687928126680. Its totient is φ = 687350516440.

The previous prime is 687639321553. The next prime is 687639321563. The reversal of 687639321559 is 955123936786.

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

It is a cyclic number.

It is not a de Polignac number, because 687639321559 - 2³¹ = 685491837911 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 687639321559.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687639321553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144398989 + ... + 144403750.

It is an arithmetic number, because the mean of its divisors is an integer number (171982031670).

Almost surely, 2^687639321559 is an apocalyptic number.

687639321559 is a deficient number, since it is larger than the sum of its proper divisors (288805121).

687639321559 is a wasteful number, since it uses less digits than its factorization.

687639321559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288805120.

The product of its digits is 73483200, while the sum is 64.

The spelling of 687639321559 in words is "six hundred eighty-seven billion, six hundred thirty-nine million, three hundred twenty-one thousand, five hundred fifty-nine".