12718821440681 has 8 divisors (see below), whose sum is σ = 12837814796040. Its totient is φ = 12600308867328.

The previous prime is 12718821440669. The next prime is 12718821440711. The reversal of 12718821440681 is 18604412881721.

It can be written as a sum of positive squares in 4 ways, for example, as 3018767251600 + 9700054189081 = 1737460^2 + 3114491^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12718821440681 is a prime.

It is a super-2 number, since 2×12718821440681² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12718821443681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120142346 + ... + 120248163.

It is an arithmetic number, because the mean of its divisors is an integer number (1604726849505).

Almost surely, 2^{12718821440681} is an apocalyptic number.

It is an amenable number.

12718821440681 is a deficient number, since it is larger than the sum of its proper divisors (118993355359).

12718821440681 is a wasteful number, since it uses less digits than its factorization.

12718821440681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240391003.

The product of its (nonzero) digits is 1376256, while the sum is 53.

The spelling of 12718821440681 in words is "twelve trillion, seven hundred eighteen billion, eight hundred twenty-one million, four hundred forty thousand, six hundred eighty-one".