685649995008 has 72 divisors (see below), whose sum is σ = 1990722453216. Its totient is φ = 207772723200.

The previous prime is 685649995001. The next prime is 685649995021. The reversal of 685649995008 is 800599946586.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685649995001) 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 in 7 ways as a sum of consecutive naturals, for example, 40572163 + ... + 40589058.

Almost surely, 2^685649995008 is an apocalyptic number.

It is an amenable number.

685649995008 is an abundant number, since it is smaller than the sum of its proper divisors (1305072458208).

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

685649995008 is a wasteful number, since it uses less digits than its factorization.

685649995008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81161251 (or 81161237 counting only the distinct ones).

The product of its (nonzero) digits is 167961600, while the sum is 69.

The spelling of 685649995008 in words is "six hundred eighty-five billion, six hundred forty-nine million, nine hundred ninety-five thousand, eight".