685720366836 has 48 divisors (see below), whose sum is σ = 1639145114880. Its totient is φ = 222984046080.

The previous prime is 685720366831. The next prime is 685720366871. The reversal of 685720366836 is 638663027586.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 685720366836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685720366831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9686160 + ... + 9756696.

It is an arithmetic number, because the mean of its divisors is an integer number (34148856560).

Almost surely, 2^685720366836 is an apocalyptic number.

It is an amenable number.

685720366836 is an abundant number, since it is smaller than the sum of its proper divisors (953424748044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

685720366836 is a wasteful number, since it uses less digits than its factorization.

685720366836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90344 (or 90342 counting only the distinct ones).

The product of its (nonzero) digits is 52254720, while the sum is 60.

The spelling of 685720366836 in words is "six hundred eighty-five billion, seven hundred twenty million, three hundred sixty-six thousand, eight hundred thirty-six".