685688431572630 has 24 divisors (see below), whose sum is σ = 1782789922089072. Its totient is φ = 182850248419344.

The previous prime is 685688431572581. The next prime is 685688431572637. The reversal of 685688431572630 is 36275134886586.

685688431572630 is a `hidden beast` number, since 6 + 8 + 5 + 6 + 8 + 8 + 43 + 1 + 572 + 6 + 3 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685688431572637) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3809380175314 + ... + 3809380175493.

It is an arithmetic number, because the mean of its divisors is an integer number (74282913420378).

Almost surely, 2^{685688431572630} is an apocalyptic number.

685688431572630 is an abundant number, since it is smaller than the sum of its proper divisors (1097101490516442).

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

685688431572630 is a wasteful number, since it uses less digits than its factorization.

685688431572630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7618760350820 (or 7618760350817 counting only the distinct ones).

The product of its (nonzero) digits is 1393459200, while the sum is 72.

The spelling of 685688431572630 in words is "six hundred eighty-five trillion, six hundred eighty-eight billion, four hundred thirty-one million, five hundred seventy-two thousand, six hundred thirty".