12456568881 has 15 divisors (see below), whose sum is σ = 18609461563. Its totient is φ = 8303709600.

The previous prime is 12456568879. The next prime is 12456568897. The reversal of 12456568881 is 18886565421.

The square root of 12456568881 is 111609.

It is a perfect power (a square), and thus also a powerful number.

12456568881 is a `hidden beast` number, since 1 + 24 + 56 + 568 + 8 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 4677328881 + 7779240000 = 68391^2 + 88200^2 .

It is not a de Polignac number, because 12456568881 - 2¹ = 12456568879 is a prime.

It is a super-2 number, since 2×12456568881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12456568841) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 998281 + ... + 1010681.

Almost surely, 2^12456568881 is an apocalyptic number.

12456568881 is the 111609-th square number.

12456568881 is the 55805-th centered octagonal number.

It is an amenable number.

12456568881 is a deficient number, since it is larger than the sum of its proper divisors (6152892682).

12456568881 is an frugal number, since it uses more digits than its factorization.

12456568881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24814 (or 12404 counting only the distinct ones).

The product of its digits is 3686400, while the sum is 54.

The spelling of 12456568881 in words is "twelve billion, four hundred fifty-six million, five hundred sixty-eight thousand, eight hundred eighty-one".