11817795720866 has 8 divisors (see below), whose sum is σ = 17790688865820. Its totient is φ = 5887566098928.

The previous prime is 11817795720817. The next prime is 11817795720877. The reversal of 11817795720866 is 66802759771811.

It can be written as a sum of positive squares in 2 ways, for example, as 9580393038841 + 2237402682025 = 3095221^2 + 1495795^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 11817795720796 and 11817795720805.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10665880061 + ... + 10665881168.

Almost surely, 2^{11817795720866} is an apocalyptic number.

11817795720866 is a deficient number, since it is larger than the sum of its proper divisors (5972893144954).

11817795720866 is a wasteful number, since it uses less digits than its factorization.

11817795720866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21331761508.

The product of its (nonzero) digits is 71124480, while the sum is 68.

The spelling of 11817795720866 in words is "eleven trillion, eight hundred seventeen billion, seven hundred ninety-five million, seven hundred twenty thousand, eight hundred sixty-six".