681638476996 has 9 divisors (see below), whose sum is σ = 1192870224399. Its totient is φ = 340818412884.

The previous prime is 681638476979. The next prime is 681638477021. The reversal of 681638476996 is 699674836186.

The square root of 681638476996 is 825614.

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

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1444825 + ... + 1857631.

Almost surely, 2^681638476996 is an apocalyptic number.

681638476996 is the 825614-th square number.

It is an amenable number.

681638476996 is a deficient number, since it is larger than the sum of its proper divisors (511231747403).

681638476996 is an frugal number, since it uses more digits than its factorization.

681638476996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825618 (or 412809 counting only the distinct ones).

The product of its digits is 564350976, while the sum is 73.

The spelling of 681638476996 in words is "six hundred eighty-one billion, six hundred thirty-eight million, four hundred seventy-six thousand, nine hundred ninety-six".