681722218017 has 12 divisors (see below), whose sum is σ = 996573845904. Its totient is φ = 449005797720.

The previous prime is 681722217971. The next prime is 681722218057. The reversal of 681722218017 is 710812227186.

It is not a de Polignac number, because 681722218017 - 2¹¹ = 681722215969 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (681722218057) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 456305959 + ... + 456307452.

It is an arithmetic number, because the mean of its divisors is an integer number (83047820492).

Almost surely, 2^681722218017 is an apocalyptic number.

It is an amenable number.

681722218017 is a deficient number, since it is larger than the sum of its proper divisors (314851627887).

681722218017 is a wasteful number, since it uses less digits than its factorization.

681722218017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 912613500 (or 912613497 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 45.

The spelling of 681722218017 in words is "six hundred eighty-one billion, seven hundred twenty-two million, two hundred eighteen thousand, seventeen".