10663440121 has 8 divisors (see below), whose sum is σ = 10681156584. Its totient is φ = 10645739520.

The previous prime is 10663440079. The next prime is 10663440143. The reversal of 10663440121 is 12104436601.

It can be written as a sum of positive squares in 4 ways, for example, as 665640000 + 9997800121 = 25800^2 + 99989^2 .

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 10663440121 - 2⁹ = 10663439609 is a prime.

It is a super-2 number, since 2×10663440121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10663440121.

It is not an unprimeable number, because it can be changed into a prime (10663440191) 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, 2335681 + ... + 2340241.

It is an arithmetic number, because the mean of its divisors is an integer number (1335144573).

Almost surely, 2^10663440121 is an apocalyptic number.

It is an amenable number.

10663440121 is a deficient number, since it is larger than the sum of its proper divisors (17716463).

10663440121 is an equidigital number, since it uses as much as digits as its factorization.

10663440121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7931.

The product of its (nonzero) digits is 3456, while the sum is 28.

Adding to 10663440121 its reverse (12104436601), we get a palindrome (22767876722).

The spelling of 10663440121 in words is "ten billion, six hundred sixty-three million, four hundred forty thousand, one hundred twenty-one".