9817810940681 has 8 divisors (see below), whose sum is σ = 10482920479680. Its totient is φ = 9172555417872.

The previous prime is 9817810940657. The next prime is 9817810940741. The reversal of 9817810940681 is 1860490187189.

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

It is a cyclic number.

It is not a de Polignac number, because 9817810940681 - 2²⁶ = 9817743831817 is a prime.

It is a super-2 number, since 2×9817810940681² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9817810948681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4963503026 + ... + 4963505003.

It is an arithmetic number, because the mean of its divisors is an integer number (1310365059960).

Almost surely, 2^{9817810940681} is an apocalyptic number.

It is an amenable number.

9817810940681 is a deficient number, since it is larger than the sum of its proper divisors (665109538999).

9817810940681 is a wasteful number, since it uses less digits than its factorization.

9817810940681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9927008095.

The product of its (nonzero) digits is 6967296, while the sum is 62.

The spelling of 9817810940681 in words is "nine trillion, eight hundred seventeen billion, eight hundred ten million, nine hundred forty thousand, six hundred eighty-one".