681681678472 has 16 divisors (see below), whose sum is σ = 1278455445900. Its totient is φ = 340760226240.

The previous prime is 681681678467. The next prime is 681681678497. The reversal of 681681678472 is 274876186186.

681681678472 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 501340466916 + 180341211556 = 708054^2 + 424666^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10040679 + ... + 10108342.

Almost surely, 2^681681678472 is an apocalyptic number.

It is an amenable number.

681681678472 is a deficient number, since it is larger than the sum of its proper divisors (596773767428).

681681678472 is a wasteful number, since it uses less digits than its factorization.

681681678472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20153256 (or 20153252 counting only the distinct ones).

The product of its digits is 43352064, while the sum is 64.

The spelling of 681681678472 in words is "six hundred eighty-one billion, six hundred eighty-one million, six hundred seventy-eight thousand, four hundred seventy-two".