12656663441 has 2 divisors, whose sum is σ = 12656663442. Its totient is φ = 12656663440.

The previous prime is 12656663429. The next prime is 12656663479. The reversal of 12656663441 is 14436665621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7868577025 + 4788086416 = 88705^2 + 69196^2 .

It is a cyclic number.

It is not a de Polignac number, because 12656663441 - 2¹⁴ = 12656647057 is a prime.

It is a super-2 number, since 2×12656663441² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12656663392 and 12656663401.

It is not a weakly prime, because it can be changed into another prime (12656663641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6328331720 + 6328331721.

It is an arithmetic number, because the mean of its divisors is an integer number (6328331721).

Almost surely, 2^12656663441 is an apocalyptic number.

It is an amenable number.

12656663441 is a deficient number, since it is larger than the sum of its proper divisors (1).

12656663441 is an equidigital number, since it uses as much as digits as its factorization.

12656663441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 44.

The spelling of 12656663441 in words is "twelve billion, six hundred fifty-six million, six hundred sixty-three thousand, four hundred forty-one".