687685676675497 has 2 divisors, whose sum is σ = 687685676675498. Its totient is φ = 687685676675496.

The previous prime is 687685676675483. The next prime is 687685676675539. The reversal of 687685676675497 is 794576676586786.

687685676675497 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 437958958745961 + 249726717929536 = 20927469^2 + 15802744^2 .

It is a cyclic number.

It is not a de Polignac number, because 687685676675497 - 2⁷ = 687685676675369 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 687685676675399 and 687685676675408.

It is not a weakly prime, because it can be changed into another prime (687685676675297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343842838337748 + 343842838337749.

It is an arithmetic number, because the mean of its divisors is an integer number (343842838337749).

Almost surely, 2^{687685676675497} is an apocalyptic number.

It is an amenable number.

687685676675497 is a deficient number, since it is larger than the sum of its proper divisors (1).

687685676675497 is an equidigital number, since it uses as much as digits as its factorization.

687685676675497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1075402137600, while the sum is 97.

The spelling of 687685676675497 in words is "six hundred eighty-seven trillion, six hundred eighty-five billion, six hundred seventy-six million, six hundred seventy-five thousand, four hundred ninety-seven".