10668556811521 has 8 divisors (see below), whose sum is σ = 12212526469184. Its totient is φ = 9129559682160.

The previous prime is 10668556811509. The next prime is 10668556811543. The reversal of 10668556811521 is 12511865586601.

It is a happy number.

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 10668556811521 - 2¹³ = 10668556803329 is a prime.

It is a super-2 number, since 2×10668556811521² (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 (10668556811581) 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, 1243127475 + ... + 1243136056.

It is an arithmetic number, because the mean of its divisors is an integer number (1526565808648).

Almost surely, 2^{10668556811521} is an apocalyptic number.

It is an amenable number.

10668556811521 is a deficient number, since it is larger than the sum of its proper divisors (1543969657663).

10668556811521 is an equidigital number, since it uses as much as digits as its factorization.

10668556811521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2486264151.

The product of its (nonzero) digits is 3456000, while the sum is 55.

The spelling of 10668556811521 in words is "ten trillion, six hundred sixty-eight billion, five hundred fifty-six million, eight hundred eleven thousand, five hundred twenty-one".