685318759 has 4 divisors (see below), whose sum is σ = 693993760. Its totient is φ = 676643760.

The previous prime is 685318757. The next prime is 685318769. The reversal of 685318759 is 957813586.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 957813586 = 2 ⋅478906793.

It is a cyclic number.

It is not a de Polignac number, because 685318759 - 2¹ = 685318757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685318757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4337382 + ... + 4337539.

It is an arithmetic number, because the mean of its divisors is an integer number (173498440).

Almost surely, 2^685318759 is an apocalyptic number.

685318759 is a deficient number, since it is larger than the sum of its proper divisors (8675001).

685318759 is an equidigital number, since it uses as much as digits as its factorization.

685318759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8675000.

The product of its digits is 1814400, while the sum is 52.

The square root of 685318759 is about 26178.5935260090. The cubic root of 685318759 is about 881.6526960994.

The spelling of 685318759 in words is "six hundred eighty-five million, three hundred eighteen thousand, seven hundred fifty-nine".