685676787533 has 2 divisors, whose sum is σ = 685676787534. Its totient is φ = 685676787532.

The previous prime is 685676787503. The next prime is 685676787539. The reversal of 685676787533 is 335787676586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 685620432484 + 56355049 = 828022^2 + 7507^2 .

It is a cyclic number.

It is not a de Polignac number, because 685676787533 - 2¹² = 685676783437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685676787539) 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 as a sum of consecutive naturals, namely, 342838393766 + 342838393767.

It is an arithmetic number, because the mean of its divisors is an integer number (342838393767).

Almost surely, 2^685676787533 is an apocalyptic number.

It is an amenable number.

685676787533 is a deficient number, since it is larger than the sum of its proper divisors (1).

685676787533 is an equidigital number, since it uses as much as digits as its factorization.

685676787533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1066867200, while the sum is 71.

The spelling of 685676787533 in words is "six hundred eighty-five billion, six hundred seventy-six million, seven hundred eighty-seven thousand, five hundred thirty-three".