12646221556653 has 6 divisors (see below), whose sum is σ = 18266764470734. Its totient is φ = 8430814371096.

The previous prime is 12646221556613. The next prime is 12646221556669. The reversal of 12646221556653 is 35665512264621.

12646221556653 is a `hidden beast` number, since 1 + 2 + 6 + 4 + 6 + 2 + 21 + 5 + 566 + 53 = 666.

12646221556653 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 12381545262564 + 264676294089 = 3518742^2 + 514467^2 .

It is not a de Polignac number, because 12646221556653 - 2²⁹ = 12645684685741 is a prime.

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 12646221556653.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12646221556613) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 702567864250 + ... + 702567864267.

Almost surely, 2^{12646221556653} is an apocalyptic number.

It is an amenable number.

12646221556653 is a deficient number, since it is larger than the sum of its proper divisors (5620542914081).

12646221556653 is a wasteful number, since it uses less digits than its factorization.

12646221556653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1405135728523 (or 1405135728520 counting only the distinct ones).

The product of its digits is 15552000, while the sum is 54.

The spelling of 12646221556653 in words is "twelve trillion, six hundred forty-six billion, two hundred twenty-one million, five hundred fifty-six thousand, six hundred fifty-three".