681113666311187 has 16 divisors (see below), whose sum is σ = 722842201579680. Its totient is φ = 639570362738688.

The previous prime is 681113666311181. The next prime is 681113666311189. The reversal of 681113666311187 is 781113666311186.

It is a cyclic number.

It is not a de Polignac number, because 681113666311187 - 2¹² = 681113666307091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681113666311181) 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, 41295623 + ... + 55385519.

It is an arithmetic number, because the mean of its divisors is an integer number (45177637598730).

Almost surely, 2^{681113666311187} is an apocalyptic number.

681113666311187 is a deficient number, since it is larger than the sum of its proper divisors (41728535268493).

681113666311187 is a wasteful number, since it uses less digits than its factorization.

681113666311187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14096470.

The product of its digits is 5225472, while the sum is 59.

Subtracting 681113666311187 from its reverse (781113666311186), we obtain a palindrome (99999999999999).

The spelling of 681113666311187 in words is "six hundred eighty-one trillion, one hundred thirteen billion, six hundred sixty-six million, three hundred eleven thousand, one hundred eighty-seven".