12650656649 has 2 divisors, whose sum is σ = 12650656650. Its totient is φ = 12650656648.

The previous prime is 12650656637. The next prime is 12650656663. The reversal of 12650656649 is 94665605621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10214740624 + 2435916025 = 101068^2 + 49355^2 .

It is an emirp because it is prime and its reverse (94665605621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12650656649 - 2⁸ = 12650656393 is a prime.

It is a super-2 number, since 2×12650656649² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12650656597 and 12650656606.

It is not a weakly prime, because it can be changed into another prime (12650659649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6325328324 + 6325328325.

It is an arithmetic number, because the mean of its divisors is an integer number (6325328325).

Almost surely, 2^12650656649 is an apocalyptic number.

It is an amenable number.

12650656649 is a deficient number, since it is larger than the sum of its proper divisors (1).

12650656649 is an equidigital number, since it uses as much as digits as its factorization.

12650656649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2332800, while the sum is 50.

The spelling of 12650656649 in words is "twelve billion, six hundred fifty million, six hundred fifty-six thousand, six hundred forty-nine".