685616507 has 2 divisors, whose sum is σ = 685616508. Its totient is φ = 685616506.

The previous prime is 685616489. The next prime is 685616531. The reversal of 685616507 is 705616586.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 685616507 - 2⁸ = 685616251 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (685616707) 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, 342808253 + 342808254.

It is an arithmetic number, because the mean of its divisors is an integer number (342808254).

Almost surely, 2^685616507 is an apocalyptic number.

685616507 is a deficient number, since it is larger than the sum of its proper divisors (1).

685616507 is an equidigital number, since it uses as much as digits as its factorization.

685616507 is an odious number, because the sum of its binary digits is odd.

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

The square root of 685616507 is about 26184.2797685940. The cubic root of 685616507 is about 881.7803604480.

The spelling of 685616507 in words is "six hundred eighty-five million, six hundred sixteen thousand, five hundred seven".