685396997637 has 48 divisors (see below), whose sum is σ = 1008558620160. Its totient is φ = 413713476000.

The previous prime is 685396997627. The next prime is 685396997653. The reversal of 685396997637 is 736799693586.

It is a happy number.

It is not a de Polignac number, because 685396997637 - 2²⁰ = 685395949061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685396997627) 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 47 ways as a sum of consecutive naturals, for example, 227026314 + ... + 227029332.

It is an arithmetic number, because the mean of its divisors is an integer number (21011637920).

Almost surely, 2^685396997637 is an apocalyptic number.

It is an amenable number.

685396997637 is a deficient number, since it is larger than the sum of its proper divisors (323161622523).

685396997637 is a wasteful number, since it uses less digits than its factorization.

685396997637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5366 (or 5355 counting only the distinct ones).

The product of its digits is 2777664960, while the sum is 78.

The spelling of 685396997637 in words is "six hundred eighty-five billion, three hundred ninety-six million, nine hundred ninety-seven thousand, six hundred thirty-seven".