12654645621 has 16 divisors (see below), whose sum is σ = 17328755520. Its totient is φ = 8211315200.

The previous prime is 12654645559. The next prime is 12654645631.

12654645621 is nontrivially palindromic in base 10.

12654645621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 12654645621 - 2¹⁴ = 12654629237 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12654645631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 336060 + ... + 371813.

It is an arithmetic number, because the mean of its divisors is an integer number (1083047220).

Almost surely, 2^12654645621 is an apocalyptic number.

It is an amenable number.

12654645621 is a deficient number, since it is larger than the sum of its proper divisors (4674109899).

12654645621 is a wasteful number, since it uses less digits than its factorization.

12654645621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708036.

The product of its digits is 345600, while the sum is 42.

The spelling of 12654645621 in words is "twelve billion, six hundred fifty-four million, six hundred forty-five thousand, six hundred twenty-one".