681388055171 has 16 divisors (see below), whose sum is σ = 704869113600. Its totient is φ = 658182513888.

The previous prime is 681388055167. The next prime is 681388055189. The reversal of 681388055171 is 171550883186.

681388055171 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 681388055171 - 2² = 681388055167 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681388055371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5481020 + ... + 5603958.

It is an arithmetic number, because the mean of its divisors is an integer number (44054319600).

Almost surely, 2^681388055171 is an apocalyptic number.

681388055171 is a deficient number, since it is larger than the sum of its proper divisors (23481058429).

681388055171 is a wasteful number, since it uses less digits than its factorization.

681388055171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124058.

The product of its (nonzero) digits is 1612800, while the sum is 53.

The spelling of 681388055171 in words is "six hundred eighty-one billion, three hundred eighty-eight million, fifty-five thousand, one hundred seventy-one".