685974871696 has 45 divisors (see below), whose sum is σ = 1346626807113. Its totient is φ = 338516617920.

The previous prime is 685974871693. The next prime is 685974871741. The reversal of 685974871696 is 696178479586.

The square root of 685974871696 is 828236.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 565149111696 + 120825760000 = 751764^2 + 347600^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685974871691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 261721266 + ... + 261723886.

Almost surely, 2^685974871696 is an apocalyptic number.

685974871696 is the 828236-th square number.

It is an amenable number.

685974871696 is a deficient number, since it is larger than the sum of its proper divisors (660651935417).

685974871696 is an frugal number, since it uses more digits than its factorization.

685974871696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5408 (or 2702 counting only the distinct ones).

The product of its digits is 1097349120, while the sum is 76.

The spelling of 685974871696 in words is "six hundred eighty-five billion, nine hundred seventy-four million, eight hundred seventy-one thousand, six hundred ninety-six".