687569438825 has 6 divisors (see below), whose sum is σ = 852586104174. Its totient is φ = 550055551040.

The previous prime is 687569438791. The next prime is 687569438849. The reversal of 687569438825 is 528834965786.

It can be written as a sum of positive squares in 3 ways, for example, as 218360878681 + 469208560144 = 467291^2 + 684988^2 .

It is not a de Polignac number, because 687569438825 - 2¹⁰ = 687569437801 is a prime.

It is a super-2 number, since 2×687569438825² (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 5 ways as a sum of consecutive naturals, for example, 13751388752 + ... + 13751388801.

It is an arithmetic number, because the mean of its divisors is an integer number (142097684029).

Almost surely, 2^687569438825 is an apocalyptic number.

It is an amenable number.

687569438825 is a deficient number, since it is larger than the sum of its proper divisors (165016665349).

687569438825 is a wasteful number, since it uses less digits than its factorization.

687569438825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27502777563 (or 27502777558 counting only the distinct ones).

The product of its digits is 696729600, while the sum is 71.

The spelling of 687569438825 in words is "six hundred eighty-seven billion, five hundred sixty-nine million, four hundred thirty-eight thousand, eight hundred twenty-five".