10661665215217 has 8 divisors (see below), whose sum is σ = 10690697388800. Its totient is φ = 10632647503584.

The previous prime is 10661665215211. The next prime is 10661665215241. The reversal of 10661665215217 is 71251256616601.

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 10661665215217 - 2¹¹ = 10661665213169 is a prime.

It is a super-2 number, since 2×10661665215217² (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 (10661665215211) 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, 2138217 + ... + 5088742.

It is an arithmetic number, because the mean of its divisors is an integer number (1336337173600).

Almost surely, 2^{10661665215217} is an apocalyptic number.

It is an amenable number.

10661665215217 is a deficient number, since it is larger than the sum of its proper divisors (29032173583).

10661665215217 is an equidigital number, since it uses as much as digits as its factorization.

10661665215217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7230975.

The product of its (nonzero) digits is 907200, while the sum is 49.

The spelling of 10661665215217 in words is "ten trillion, six hundred sixty-one billion, six hundred sixty-five million, two hundred fifteen thousand, two hundred seventeen".