685561607 has 2 divisors, whose sum is σ = 685561608. Its totient is φ = 685561606.

The previous prime is 685561589. The next prime is 685561619. The reversal of 685561607 is 706165586.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 685561607 - 2⁶ = 685561543 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685561687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342780803 + 342780804.

It is an arithmetic number, because the mean of its divisors is an integer number (342780804).

Almost surely, 2^685561607 is an apocalyptic number.

685561607 is a deficient number, since it is larger than the sum of its proper divisors (1).

685561607 is an equidigital number, since it uses as much as digits as its factorization.

685561607 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 302400, while the sum is 44.

The square root of 685561607 is about 26183.2314086707. The cubic root of 685561607 is about 881.7568239503.

The spelling of 685561607 in words is "six hundred eighty-five million, five hundred sixty-one thousand, six hundred seven".