685634883549 has 32 divisors (see below), whose sum is σ = 1143138886656. Its totient is φ = 355117029120.

The previous prime is 685634883523. The next prime is 685634883559. The reversal of 685634883549 is 945388436586.

It is not a de Polignac number, because 685634883549 - 2⁸ = 685634883293 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685634883559) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4325887 + ... + 4481580.

It is an arithmetic number, because the mean of its divisors is an integer number (35723090208).

Almost surely, 2^685634883549 is an apocalyptic number.

It is an amenable number.

685634883549 is a deficient number, since it is larger than the sum of its proper divisors (457504003107).

685634883549 is a wasteful number, since it uses less digits than its factorization.

685634883549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8807825.

The product of its digits is 597196800, while the sum is 69.

The spelling of 685634883549 in words is "six hundred eighty-five billion, six hundred thirty-four million, eight hundred eighty-three thousand, five hundred forty-nine".