685543856603 has 2 divisors, whose sum is σ = 685543856604. Its totient is φ = 685543856602.

The previous prime is 685543856593. The next prime is 685543856653. The reversal of 685543856603 is 306658345586.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 685543856603 - 2¹⁶ = 685543791067 is a prime.

It is a super-2 number, since 2×685543856603² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (685543856653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342771928301 + 342771928302.

It is an arithmetic number, because the mean of its divisors is an integer number (342771928302).

Almost surely, 2^685543856603 is an apocalyptic number.

685543856603 is a deficient number, since it is larger than the sum of its proper divisors (1).

685543856603 is an equidigital number, since it uses as much as digits as its factorization.

685543856603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208000, while the sum is 59.

The spelling of 685543856603 in words is "six hundred eighty-five billion, five hundred forty-three million, eight hundred fifty-six thousand, six hundred three".