685253636765 has 8 divisors (see below), whose sum is σ = 822578392248. Its totient is φ = 548020224000.

The previous prime is 685253636761. The next prime is 685253636887. The reversal of 685253636765 is 567636352586.

It can be written as a sum of positive squares in 4 ways, for example, as 7005857401 + 678247779364 = 83701^2 + 823558^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 685253636765 - 2² = 685253636761 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 685253636698 and 685253636707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685253636761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22819172 + ... + 22849181.

It is an arithmetic number, because the mean of its divisors is an integer number (102822299031).

Almost surely, 2^685253636765 is an apocalyptic number.

It is an amenable number.

685253636765 is a deficient number, since it is larger than the sum of its proper divisors (137324755483).

685253636765 is a wasteful number, since it uses less digits than its factorization.

685253636765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45671359.

The product of its digits is 163296000, while the sum is 62.

The spelling of 685253636765 in words is "six hundred eighty-five billion, two hundred fifty-three million, six hundred thirty-six thousand, seven hundred sixty-five".