687439765219 has 2 divisors, whose sum is σ = 687439765220. Its totient is φ = 687439765218.

The previous prime is 687439765193. The next prime is 687439765223. The reversal of 687439765219 is 912567934786.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 687439765219 - 2³¹ = 685292281571 is a prime.

It is a super-2 number, since 2×687439765219² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (687439705219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343719882609 + 343719882610.

It is an arithmetic number, because the mean of its divisors is an integer number (343719882610).

Almost surely, 2^687439765219 is an apocalyptic number.

687439765219 is a deficient number, since it is larger than the sum of its proper divisors (1).

687439765219 is an equidigital number, since it uses as much as digits as its factorization.

687439765219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 137168640, while the sum is 67.

The spelling of 687439765219 in words is "six hundred eighty-seven billion, four hundred thirty-nine million, seven hundred sixty-five thousand, two hundred nineteen".