12456717522452 has 144 divisors (see below), whose sum is σ = 28796415157440. Its totient is φ = 4670293275648.

The previous prime is 12456717522421. The next prime is 12456717522467. The reversal of 12456717522452 is 25422571765421.

It is a super-2 number, since 2×12456717522452² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a junction number, because it is equal to n+sod(n) for n = 12456717522394 and 12456717522403.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1499063 + ... + 5211585.

It is an arithmetic number, because the mean of its divisors is an integer number (199975105260).

Almost surely, 2^{12456717522452} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12456717522452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14398207578720).

12456717522452 is an abundant number, since it is smaller than the sum of its proper divisors (16339697634988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12456717522452 is a wasteful number, since it uses less digits than its factorization.

12456717522452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3712630 (or 3712621 counting only the distinct ones).

The product of its digits is 9408000, while the sum is 53.

The spelling of 12456717522452 in words is "twelve trillion, four hundred fifty-six billion, seven hundred seventeen million, five hundred twenty-two thousand, four hundred fifty-two".