685681225671 has 24 divisors (see below), whose sum is σ = 990838573056. Its totient is φ = 421590717600.

The previous prime is 685681225661. The next prime is 685681225673. The reversal of 685681225671 is 176522186586.

It is not a de Polignac number, because 685681225671 - 2⁷ = 685681225543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685681225673) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3945 + ... + 1171058.

It is an arithmetic number, because the mean of its divisors is an integer number (41284940544).

Almost surely, 2^685681225671 is an apocalyptic number.

685681225671 is a deficient number, since it is larger than the sum of its proper divisors (305157347385).

685681225671 is a wasteful number, since it uses less digits than its factorization.

685681225671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1176183 (or 1176170 counting only the distinct ones).

The product of its digits is 9676800, while the sum is 57.

The spelling of 685681225671 in words is "six hundred eighty-five billion, six hundred eighty-one million, two hundred twenty-five thousand, six hundred seventy-one".