687845741771 has 4 divisors (see below), whose sum is σ = 687849680544. Its totient is φ = 687841803000.

The previous prime is 687845741747. The next prime is 687845741773. The reversal of 687845741771 is 177147548786.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687845741771 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 687845741698 and 687845741707.

It is not an unprimeable number, because it can be changed into a prime (687845741773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1694660 + ... + 2060961.

It is an arithmetic number, because the mean of its divisors is an integer number (171962420136).

Almost surely, 2^687845741771 is an apocalyptic number.

687845741771 is a deficient number, since it is larger than the sum of its proper divisors (3938773).

687845741771 is a wasteful number, since it uses less digits than its factorization.

687845741771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3938772.

The product of its digits is 73758720, while the sum is 65.

The spelling of 687845741771 in words is "six hundred eighty-seven billion, eight hundred forty-five million, seven hundred forty-one thousand, seven hundred seventy-one".