12656331645 has 8 divisors (see below), whose sum is σ = 20250130656. Its totient is φ = 6750043536.

The previous prime is 12656331631. The next prime is 12656331719. The reversal of 12656331645 is 54613365621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12656331645 - 2¹⁵ = 12656298877 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12656331597 and 12656331606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 421877707 + ... + 421877736.

It is an arithmetic number, because the mean of its divisors is an integer number (2531266332).

Almost surely, 2^12656331645 is an apocalyptic number.

12656331645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12656331645 is a deficient number, since it is larger than the sum of its proper divisors (7593799011).

12656331645 is an equidigital number, since it uses as much as digits as its factorization.

12656331645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843755451.

The product of its digits is 388800, while the sum is 42.

The spelling of 12656331645 in words is "twelve billion, six hundred fifty-six million, three hundred thirty-one thousand, six hundred forty-five".