685721712132 has 72 divisors (see below), whose sum is σ = 1903910823360. Its totient is φ = 207128750400.

The previous prime is 685721712119. The next prime is 685721712163. The reversal of 685721712132 is 231217127586.

685721712132 is a `hidden beast` number, since 6 + 8 + 572 + 1 + 71 + 2 + 1 + 3 + 2 = 666.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 21778119 + ... + 21809582.

It is an arithmetic number, because the mean of its divisors is an integer number (26443205880).

Almost surely, 2^685721712132 is an apocalyptic number.

It is an amenable number.

685721712132 is an abundant number, since it is smaller than the sum of its proper divisors (1218189111228).

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

685721712132 is a wasteful number, since it uses less digits than its factorization.

685721712132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43587753 (or 43587748 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The spelling of 685721712132 in words is "six hundred eighty-five billion, seven hundred twenty-one million, seven hundred twelve thousand, one hundred thirty-two".